June 30, 1979 

Abalone Alliance Concert

It was San Luis Obispo County’s Woodstock only with less mud, sex, drugs or rock and roll but more politics. They estimated 20,000 would attend.
Over 30,000 people jammed Highway 1 for a combination music festival and anti-nuclear rally.

Read more here: http://sloblogs.thetribunenews.com/slovault/2008/10/abalone-alliance-concert/#storylink=cpy