開催

To truly understand the Japanese noun 開催 (kaisai), one must first break down its constituent kanji characters in great detail. The first character, 開 (kai), carries the fundamental meaning of 'to open,' 'to unfold,' or 'to unseal.' We see this kanji in common verbs such as 開く (hiraku - to open) and 開ける (akeru - to open). The second character, 催 (sai), means 'to hold,' 'to organize,' 'to sponsor,' or 'to host.' It is found in words like 催し (moyoshi - an event or gathering) and 主催 (shusai - sponsorship or hosting). When these two powerful characters are combined, they create a highly formal and professional term that specifically refers to the act of holding, hosting, or opening an event, exhibition, conference, or significant gathering. Unlike the more casual verb 行う (okonau), which simply means 'to do' or 'to carry out,' 開催 carries an inherent sense of scale, preparation, and public or official significance. You would not use 開催 for a small, private dinner with friends; instead, you would use it for the Olympic Games, a corporate shareholder meeting, an international summit, or a large-scale public festival.

Formal Contexts

Used predominantly in business, news, and official announcements to denote the hosting of an event.

Understanding this distinction is absolutely crucial for learners of Japanese who wish to navigate business environments, read the news, or comprehend formal announcements. The nuance of 開催 implies that there is an organizer, an audience or set of participants, and a specific venue or platform where the event takes place. Furthermore, it is important to note that 開催 is a 'suru-verb' (する動詞), meaning that by attaching the auxiliary verb する (suru - to do), the noun transforms into the active verb 開催する (kaisaisuru - to hold an event). In passive constructions, which are incredibly common in formal Japanese, it becomes 開催される (kaisaisareru - to be held). This passive form is frequently seen on posters, invitations, and news broadcasts, as the focus is often on the event itself rather than the specific individuals organizing it.

Active vs Passive

Active: 開催する (to hold). Passive: 開催される (to be held). The passive is much more common in public notices.

Let us delve deeper into the various dimensions of this word. When you see 開催, it is often compounded with other characters to create highly specific business terms. For example, 開催地 (kaisai-chi) refers to the host city or location of the event. 開催期間 (kaisai-kikan) refers to the duration or period during which the event is held. 開催中 (kaisai-chuu) means that the event is currently in progress or currently open. These compound words are ubiquitous in Japanese society, appearing on banners outside department stores, on digital advertisements on trains, and in the subject lines of corporate emails. The word inherently commands a level of respect and formality. It tells the reader or listener that the event being discussed is not a mere spontaneous get-together, but a planned, structured, and officially sanctioned occurrence. This is why mastering 開催 is a significant milestone for any Japanese learner transitioning from conversational fluency to professional and academic proficiency.

Compound Words

Words like 開催地 (host location) and 開催中 (currently being held) are essential for daily life in Japan.

In summary, 開催 is a robust, formal, and highly useful word that encapsulates the entire concept of organizing, hosting, and executing an event. Its usage is a clear indicator of a speaker's or writer's ability to operate within the formal registers of the Japanese language, making it an indispensable tool in your vocabulary arsenal. Whether you are reading a news article about a global summit, checking the dates for a local cultural festival, or drafting an email to invite colleagues to a seminar, 開催 is the precise and appropriate word to use.

Mastering the usage of 開催 (kaisai) requires an understanding of its grammatical flexibility and the specific contexts in which it thrives. As a verbal noun (often referred to as a suru-verb), 開催 can function both as a standalone noun and as an action verb when combined with する (suru). This dual nature makes it incredibly versatile in formal Japanese writing and speech. When used as a noun, it often appears in compound structures or is modified by adjectives and descriptive phrases. For instance, you might encounter phrases like 'イベントの開催' (ibento no kaisai - the holding of the event) or '開催の準備' (kaisai no junbi - preparations for hosting). In these cases, 開催 acts as the core concept around which the rest of the sentence is built. It is the central pillar of event-related discourse in business and formal settings.

Noun Usage

Used with the particle の (no) to connect to other nouns, e.g., 開催の日時 (date and time of holding).

When transformed into a verb via the addition of する (suru), 開催 takes on an active role. 開催する (kaisaisuru) means 'to hold' or 'to host.' However, because events are often spoken about in terms of their occurrence rather than the specific people organizing them, the passive form 開催される (kaisaisareru - to be held) is statistically much more common in everyday Japanese. You will see this passive form on almost every event poster, news bulletin, and formal invitation. For example, '会議が開催される' (kaigi ga kaisaisareru - the meeting will be held) sounds much more natural and professional in a public announcement than saying '私たちが会議を開催する' (watashitachi ga kaigi o kaisaisuru - we will hold the meeting), unless the specific goal is to emphasize the organizer's role. This preference for the passive voice is a hallmark of formal Japanese communication, reflecting a cultural tendency to emphasize the collective event over individual action.

Verb Conjugations

開催します (will hold), 開催しました (held), 開催されます (will be held), 開催されました (was held).

Another critical aspect of using 開催 is understanding its temporal and spatial compounds. By attaching suffixes, you can create highly specific vocabulary words that are essential for logistical planning. 開催中 (kaisai-chuu) means 'currently being held' or 'in progress.' This is frequently seen on signs outside museums, department stores, and convention centers. 開催地 (kaisai-chi) refers to the 'host location' or 'venue city,' a term you will hear constantly during international sporting events like the World Cup or the Olympics. 開催日 (kaisai-bi) means the 'date of the event,' and 開催期間 (kaisai-kikan) refers to the 'event period' or 'duration.' By mastering these compounds, you can extract vital information from Japanese texts with ease. You will no longer just see a block of kanji; you will immediately recognize the who, what, where, and when of any formal gathering.

Time and Place

Combine 開催 with 日 (day), 地 (place), or 期間 (period) to specify event details.

Finally, it is important to pair 開催 with the correct particles. When indicating the event being held, use the particle が (ga) for passive sentences (イベントが開催される) and を (o) for active sentences (イベントを開催する). When indicating the location, use the particle で (de), as in '東京でオリンピックが開催される' (The Olympics will be held in Tokyo). Using the particle に (ni) for the location is a common mistake among learners and should be avoided in this specific context, as 開催 implies an action taking place at a location, rather than a state of being. By paying close attention to these grammatical nuances, you can elevate your Japanese from functional to highly proficient, ensuring that your communication is both accurate and culturally appropriate in formal settings.

The word 開催 (kaisai) is ubiquitous in Japanese society, but it is heavily concentrated in specific, formal environments. You are highly unlikely to hear this word used among friends discussing their weekend plans at an izakaya. Instead, 開催 belongs to the realm of public life, business, media, and official organization. One of the most common places you will encounter 開催 is in the news. Whether you are watching NHK, reading the Yomiuri Shimbun, or scrolling through Yahoo Japan News, 開催 is the standard term used by journalists to report on events. When a political summit is organized, when a major sports tournament begins, or when a local city hosts a cultural festival, the headlines will invariably feature the word 開催. For example, 'G7サミットが広島で開催される' (The G7 Summit will be held in Hiroshima) is a classic journalistic sentence structure. For learners of Japanese, recognizing this word is a major key to unlocking reading comprehension for daily news consumption.

News and Media

Standard vocabulary for reporting on political, sporting, and cultural events.

Another primary domain for 開催 is the corporate and business world. If you work in a Japanese company or interact with Japanese clients, 開催 will be a staple of your professional vocabulary. It is used in internal emails to announce meetings, training sessions, and corporate seminars. For instance, an email subject line might read '第3回マーケティング会議開催のお知らせ' (Notice of the Holding of the 3rd Marketing Meeting). In external communications, companies use 開催 to invite clients to product launches, exhibitions, and networking events. The formality of the word perfectly matches the polite, structured nature of Japanese business etiquette (Keigo). Using 開催 demonstrates professionalism and respect for the attendees. It shows that the event is official, organized, and worthy of the participants' time. If you are drafting a business proposal or an invitation, choosing 開催 over a simpler word like 行う (okonau) immediately elevates the tone of your writing.

Business Communications

Essential for emails, meeting agendas, and official corporate invitations.

Beyond news and business, 開催 is visually omnipresent in Japan's public spaces. If you walk through a major train station like Shinjuku or Shibuya, you will be bombarded with advertisements and posters for various events. Art exhibitions, department store sales, anime pop-up shops, and music concerts all utilize 開催 in their promotional materials. You will frequently see the bold red characters 開催中 (kaisai-chuu - currently being held) plastered across storefronts to draw in customers. You will see 開催決定 (kaisai-kettei - holding confirmed/decided) on movie posters announcing a special screening or a sequel's release event. This visual repetition makes 開催 one of the most easily recognizable kanji compounds for tourists and residents alike. It acts as a beacon, signaling that something organized and noteworthy is happening in that location.

Public Signage

Frequently seen on posters, digital billboards, and storefronts to advertise events.

Finally, 開催 is heavily used in the context of local community and government notices. City halls and ward offices regularly send out newsletters or post on their websites about local happenings. Whether it is a disaster preparedness drill, a neighborhood summer festival (matsuri), or a public health seminar, the local government will use 開催 to inform residents. This highlights that while 開催 is formal, it is not exclusively for elite or massive global events; it is simply the correct administrative term for any officially organized gathering. By familiarizing yourself with 開催, you empower yourself to participate more fully in Japanese society, from understanding global news to attending your local neighborhood festival.

While 開催 (kaisai) is a highly structured and logical word, learners of Japanese frequently make several specific mistakes when attempting to integrate it into their vocabulary. The most prevalent mistake is an error of register and scale. Because 開催 translates to 'hold' or 'host' in English, English speakers often apply it to informal, small-scale, or personal events. For example, a learner might say '明日、私の家でパーティーを開催します' (Tomorrow, I will hold a party at my house). While grammatically correct, this sounds incredibly unnatural and almost comical to a native Japanese speaker. It sounds as though you are organizing a massive, formal, officially sanctioned gala in your living room. For personal gatherings, casual parties, or small meetups, simpler verbs like やる (yaru - to do), する (suru - to do), or 開く (hiraku - to open/hold) are much more appropriate. 開催 must be reserved for events that have a degree of public significance, formal organization, or institutional backing.

Scale Mismatch

Do not use 開催 for private, small, or casual gatherings like family dinners or small house parties.

Another common grammatical mistake involves the misuse of location particles. When stating where an event is being held, learners often mistakenly use the particle に (ni), which indicates a state of existence or a destination. For example, they might write '東京にオリンピックが開催される' (The Olympics will be held in Tokyo). This is incorrect because 開催 represents an action or an activity taking place, not merely something existing in a location. The correct particle to use for the location of an action is で (de). Therefore, the correct sentence is '東京でオリンピックが開催される'. This distinction between に and で is a fundamental grammar point in Japanese, but the formal nature of 開催 sometimes causes learners to overthink and default to the wrong particle. Always remember: Action = で.

Particle Errors

Always use で (de) for the location of the event, never に (ni).

A third frequent error is the confusion between the active and passive forms of the verb. As mentioned in previous sections, Japanese strongly prefers the passive voice when discussing events, because the focus is on the event itself rather than the organizers. Learners often default to the active voice, saying '政府が会議を開催する' (The government will hold the meeting). While this is not strictly incorrect, it is often less natural than saying '会議が開催される' (The meeting will be held). More problematically, learners sometimes mix up the particles when trying to use the passive form, resulting in sentences like '会議を開催される' (using the object particle を with a passive verb). The correct structure for the passive is [Event] が 開催される. Mastering this passive structure is essential for sounding natural and proficient in formal Japanese contexts.

Active/Passive Confusion

Ensure you use が with the passive 開催される, and を with the active 開催する.

Lastly, learners sometimes confuse 開催 with similar-sounding or similar-meaning words, such as 主催 (shusai - sponsorship/hosting) or 開会 (kaikai - opening of a meeting). While 開催 refers to the overall holding of the event, 主催 refers specifically to the entity that is sponsoring or taking primary responsibility for the event. 開会 refers only to the specific moment the event begins (the opening ceremony). Using 開催 when you mean 主催 can lead to confusion about who is actually in charge of the event. By paying close attention to these nuances, scale, particles, and voice, you can avoid the most common pitfalls and use 開催 with the confidence and precision of a native speaker.

The Japanese language is rich with vocabulary related to organizing, hosting, and executing events. To fully master 開催 (kaisai), it is highly beneficial to compare and contrast it with its closest synonyms. By understanding the subtle boundaries between these words, you can select the most precise term for any given situation. The most common synonym that learners encounter is 行う (okonau). 行う is a highly versatile verb that means 'to do,' 'to carry out,' or 'to conduct.' It can be used for events, just like 開催, but it is much broader in scope. You can 行う an investigation, a test, or a daily routine. 開催, on the other hand, is strictly limited to events, gatherings, and exhibitions. Furthermore, 行う is slightly less formal and grandiose than 開催. If a local school is having a sports day, 行う is perfectly suitable. If a nation is hosting the World Expo, 開催 is the expected terminology.

行う (okonau)

Broader and slightly less formal. Means 'to carry out' or 'to conduct' any action, not just events.

Another closely related word is 開く (hiraku). This verb literally means 'to open,' but it is frequently used to mean 'to hold a meeting or party.' 開く is the perfect middle ground between the extreme formality of 開催 and the casualness of やる (yaru). You can use 開く for a personal party (パーティーを開く), a study group (勉強会を開く), or a small business meeting (会議を開く). It implies the act of opening the doors and welcoming people in. 開催 shares the same first kanji (開), but the addition of 催 elevates it to a level of institutional organization that 開く lacks. If you are unsure whether an event is formal enough for 開催, 開く is often a safe and natural-sounding alternative that won't make you sound overly dramatic.

開く (hiraku)

Means 'to open' or 'to hold.' Great for medium-scale or personal events like parties and study groups.

Within the realm of formal event organization, there are several kanji compounds that look and sound similar to 開催 but have distinct legal or logistical meanings. 主催 (shusai) means 'sponsorship' or 'primary hosting.' While 開催 focuses on the fact that the event is happening, 主催 focuses on WHO is paying for and organizing it. For example, '東京都主催のイベントが開催される' (An event sponsored by Tokyo Metropolis will be held). 共催 (kyousai) means 'co-sponsorship' or 'joint hosting,' used when two or more organizations team up to hold an event. 協賛 (kyousan) means 'support' or 'sponsorship' in the sense of providing funding or resources, rather than organizing the event itself. Understanding these distinctions is vital for reading business proposals, event posters, and formal press releases, as they clearly delineate the roles of the various organizations involved.

主催 (shusai) vs 開催 (kaisai)

主催 focuses on the organizer (the sponsor). 開催 focuses on the occurrence of the event itself.

Finally, we have words that refer to specific parts of an event. 開会 (kaikai) means the 'opening of a meeting,' referring specifically to the moment the event begins. Its opposite is 閉会 (heikai), the 'closing of a meeting.' 開催 covers the entire duration of the event, from 開会 to 閉会. By building a mental map of these related terms—from the casual 開く to the broad 行う, and the specific organizational roles of 主催 and 共催—you create a robust framework for understanding and discussing events in Japanese. This nuanced vocabulary allows you to express exactly what kind of event is happening, who is running it, and what your role in it might be.