Answer:
Performance art is an artwork or art exhibition created through actions executed by the artist or other participants. It may be live, through documentation, spontaneously or written, presented to a public in a Fine Art context, traditionally interdisciplinary.
Happening is a performance, event, or situation art, usually as performance art.
Flash mob is a group of people who assemble suddenly in a public place, perform for a brief time, then quickly disperse, often for the purposes of entertainment, satire, and artistic expression.
Explanation:
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