fest

UK: /fɛst/

Collins Concise English Dictionary © HarperCollins Publishers::

fest / fɛst/ noun

1. a meeting or event at which the emphasis is on a particular activity: a fashion fest
2. (in combination): schmaltz-fest, lovefest

Etymology: 19th Century: from German Fest festival

WordReference Random House Learner's Dictionary of American English © 2025

-fest, suffix. 

1. -fest is attached to nouns to form nouns with the meaning "an assembly of people engaged in a common activity'' named by the first element of the compound:
   gab + -fest → gabfest (= group of people gabbing or talking a lot);
   song + -fest → songfest (= assembly of people singing together).

WordReference Random House Unabridged Dictionary of American English © 2025

-fest, 

1. a combining form occurring in compound words that have the general sense "an assembly of people engaged in a common activity'';
   the first element of the compound usually specifies the activity:
   gabfest;
   slugfest;
   songfest.

• German Fest festival, holiday (see feast), as in Sängerfest choral festival