noun
entertainment; performance; side show
Refers to entertainment or performances put on at parties, banquets, or other gatherings, often by guests or attendees. Can include skits, songs, games, or other lighthearted acts.
忘年会で余興を披露した。
I performed a party piece at the year-end party.
彼の余興はいつも面白い。
His party performances are always funny.
Composed of 余 (extra, remaining) and 興 (entertainment, interest), literally 'extra entertainment'. The word has been used since at least the Edo period to refer to supplementary amusements at gatherings.