Conversation so far:
How did Buffalo Springstein form?
Buffalo Springfield formed in 1966 following a fortuitous encounter in a Los Angeles traffic jam between Stills and Furay and Young and Palmer.
How did Richard Furay get involved with Buffalo Springstein?
While Young and Palmer were stuck in traffic on Sunset Boulevard, they were spotted by Stills and Richie Furay. The musicians pulled off the road and reunited.
What was Richie Furray invited to with Buffalo Springfield?
Stills invited fellow Au Go Go Singers alumnus Richie Furay and former Squires bass player Ken Koblun to come join him in California.

Question: What did they do in California?
Self-contained rewrite: What did Buffalo Springfield do in California?