Which 1967 California festival did The Who perform at?

The Who performed at the 1967 Monterey Pop Festival in California.

Officially called the Monterey International Pop Festival, the event took place at the Monterey County Fairgrounds from June 16 to 18, 1967. It brought together major established performers and emerging acts from Britain and the United States, including the Jimi Hendrix Experience, Janis Joplin, Otis Redding, Ravi Shankar, Jefferson Airplane, and the Who.

The Who's short, explosive set became one of the festival's defining moments. During “My Generation,” Pete Townshend smashed his guitar and struck the equipment, while Keith Moon kicked over his drum kit. The performance helped introduce the already successful British band to a much wider American audience.

Monterey is often regarded as a key beginning of the Summer of Love and an important model for later festivals such as Woodstock. It was also documented in D. A. Pennebaker's 1968 concert film Monterey Pop. The other options refer to different festivals and are not the California event in question.