Smoke-in

[1] The Youth International Party (YIP) organized "smoke-ins" across North America through the 1970s and into the 1980s.

[2][3] There was a culture clash when many of the hippie protesters strolled en masse into the nearby "Honor America Day" festivities with Billy Graham and Bob Hope.

[4] On August 7, 1971, a Yippie smoke-in in Vancouver was attacked by police, resulting in the Gastown Riot, one of the most famous protests in Canadian history.

[5] The annual July 4 Yippie smoke-in in Washington, D.C., became a counterculture tradition.

[6][7][8][9] Other smoke-ins as protests for cannabis law reform have been held in the 1960s in London;[10] and through the 1990s at least at the U.S. Capitol,[11] and in and around Austin, Texas.

Yippie van makes a few passes by the July 4th Smoke-In, Lafayette Park , Washington, D.C., 1977.
Poster advertising Yippie-sponsored Pittsburgh Smoke-In, Schenley Park , July 2, 1977