The Beach Boys were the last act of the day for "Y-Day", sponsored by the Hollywood YMCA and local station KFWB. They were only supposed to perform three songs, but decided on-the-spot to perform "Surfer Girl" as well. They also sang a short acapella tribute to KFWB.
The date for this concert was actually October 19th, 1963, not November 1st, as widely (and incorrectly) claimed. Ads for the show indicate the 10/19 date. The ads also include the opening acts: Jan and Dean, Bobby Vinton and Duane Eddy. Art Linkletter hosted.