a school festival (events held at schools, such as food stalls, performances, and exhibitions).
大学の学祭でバンドを演奏した。
I played in a band at the university festival.
学祭の準備は夏休み明けから本格的に始まる。
Preparations for the school festival really start after the summer break.
学祭では模擬店でクラスメイトと料理を売った。
At the school festival, I sold food with my classmates at a booth.