This is the 2477th most frequent Japanese word.
催し
An event or gathering.
Here, '催し' indicates an organized gathering or function planned by someone.
彼の企画した催しは大成功だった。
The event he organized was a great success.
In this context, '催し' is used as a term for the subject or agenda of an organized event.
催しの内容について詳しく教えてください。
Please explain the details of the event.
In this sentence, '催し物' refers to a specific event or activity organized for public entertainment.