noun
summer festival; summer music festival
Typically refers to a large outdoor music festival held in summer, but can also include other summer events. The term is a modern abbreviation of 夏のフェスティバル.
今年の夏フェスはロックバンドがたくさん出るらしい。
I heard a lot of rock bands will play at this year's summer festival.
夏フェスに行くために有給を取った。
I took paid leave to go to the summer music festival.