Today George and Ringo, their wives, and Mal Evans flew from London to California. Says The Beatles Bible,

The purpose of the visit was for Harrison1to make a guest appearance in Ravi Shankar’s film Raga. The scene was filmed on 10 and 11 June in the Big Sur area of San Francisco,2but the party stayed in Monterey during their visit.

And that is probably all the information that you require at this point. Paul and John would continue to work on new songs in their absence, but more on that later.