The social phenomenon called "Summer of Love" happened during which year?

The "Summer of Love" was a social phenomenon that occurred during mid-1967, when as many as 100,000 people, mostly young people sporting hippie fashions of dress and behavior, converged in San Francisco's neighborhood of Haight-Ashbury. More broadly, the "Summer of Love" encompassed the hippie music, drug, anti-war, and free-love scene throughout the American west coast, and as far away as New York City.

Hippies, sometimes called flower children, were an eclectic group. Many were suspicious of the government, rejected consumerist values, and generally opposed the Vietnam War. A few were interested in politics; others were concerned more with art (music, painting, poetry in particular) or spiritual and meditative practices.