The first requirement is that you have to be totally over the hill – but that’s only because the request involves a decades-old event in San Diego rock history, namely the Beatles’ performance in Balboa Stadium in 1965. Richard Houghton, a British author researching a book about the iconic foursome, is looking for input from readers who may have seen the concert. We do know that the show’s promoters spent a total of $33.96 on the guys’ food and that an airline strike forced them to ride by bus from L.A. to San Diego – maybe you have a few chestnuts of your own along these lines. Houghton, author of “You Had to Be There!: The Rolling Stones Live, 1962-69,” would welcome your stuff. You can reach him at [email protected] or by letter at 7 Hartley Rd., Manchester, M21 9NG, United Kingdom.