love-in
love-in {n.}, {slang}, {informal}
A festival or occasion to celebrate life, human sensuality, the beauty of nature, human sexuality, and universal love; affairs so conceived by some frequently deteriorate into obscenity and drug using sessions in parody of their stated purpose.
The hippies gathered for a big love-in in the Halght-Ashbury district of San Francisco.
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Source: A Dictionary of American Idioms