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An internet search turned up no information about what the Beatles might have been doing on this particular day. The short answer is, whatever the hell they wanted to do — except, you know, go anywhere in public without starting a huge commotion.
But for an interesting read check out this PDF of the April 9, 1966 issue of “KRLA Beat, America’s Largest Teen NEWSpaper,” featuring articles on Sonny Bono, Joan Baez, The Kinks, Mitch Ryder, Herb Alpert, and, oh yeah, The Beatles:
http://krlabeat.sakionline.net/issue/9apr66.pdf
The history of the KRLABeat newsletter is interesting in itself, and tells us something about the Beatles’ major impacts on American pop radio and journalism.
http://krlabeat.sakionline.net/history.html