The Summer of Love was a major social phenomenon that occurred in San Francisco during the summer of 1967. As many as 100,000 people, mostly young people, hippies, beatniks, and 1960s counterculture figures, converged in San Francisco's Haight-Ashbury district and Golden Gate Park. Inspired by Jack Kerouac's On the Road (1957) and the Beat Generation of authors of the 1950s, who had flourished in the North Beach area of San Francisco, those who gathered in Haight-Ashbury during 1967 allegedly rejected the conformist and materialist values of modern life and adhered to the psychedelic movement; there was an emphasis on sharing and community.

Source: Wikipedia