By May 1963, the Beatles were the biggest thing in British pop music. On the 2nd of May they had the first of their 17 number one singles, "From Me to You", which stayed at the top of the charts until the middle of June, and on the 11th their first album, "Please Please Me", also hit number one.
It had all happened really quickly - their first single had only been released the previous October, and on their first tour in February they had been bottom of a six-act bill. For their third nationwide tour though, they were clearly the headline act, although Roy Orbison was nominally top of the bill.