I am afraid people don't check the front page for announcements/easily forget them, so I think it's appropriate to make this reminder when there's a little over a month until teh event
There's enough information there (@ https://www.heyuri.net/#news74 ), it's going to happen on 2025/11/02 (Sun) but I'll paste mod-san's explanation from >>69310 on what is a bunkasai

Bunkasai means "cultural festival" - you often see it in teh animez set in school. All the classes work on producing some kind of fun/creative feature (e.g. food stands, themed cafes, haunted houses, sports/games, drama/music performances, etc.), and then the school is opened up to the public to see it all

On Heyuri, we designate a specific day (though things like this are fully welcome any day of the year) for us to all create fun/creative things for each other to see and experience

There's no limits or expectations - just whatever you (or your group) can come up with

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You may also use this thread for cooperation, exchanging ideas or general suggestions