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. [TahlilGaran] English Idioms Dictionary ▲