主催

1. Origins, structure, and basic meaning

• Structure: 主催 is a noun read しゅさい, meaning hosting or organizing an event. It forms 主催する, and an organizer is a 主催者.
• Basic usage: It can identify an institution that holds a meeting or the organizers from whom a schedule-change notice arrives.
  • 地域の図書館が読書会を主催しました。 says that the local library hosted a book club meeting; 大会の主催者から日程変更の連絡が届きました。 says that notice of a schedule change arrived from the tournament organizers.

2. Common pitfalls and similar expressions

• 読書会を主催する
  • を marks the book club meeting as the event organized by the library.
• 主催者から
  • から identifies the tournament organizers as the source of the notice.
• 主催 and 参加
  • 主催 is organizing and holding an event, while 参加 is taking part in an event arranged by others.