a beer/song/food etc festan informal occasion when a lot of people do a fun activity together, such as drinking beer, singing songs, or eating food 啤酒节/音乐节/食品节等
→slugfest
Examples from the Corpus
fest• Sedona ran its second annual film fest a few weeks ago.• There are a number of exciting acts featured at this year's fest.
-fest /fest/ suffix [in nouns] informal
used to form nouns referring to events that have a lot of a particular thing or have a very great effect of a particular kind 〔用于构成名词,指某一类活动或某种极强的效果〕