This was the first day of filming at the Scala Theatre in London, where the performance finale of A Hard Day's Night took place. In all The Beatles were at the Scala for seven working days, until 31 March when the final performance in front of an audience took place.
Monday 23 March 1964
John Lennon's first book, In His Own Write, was published on this day by Jonathan Cape.
The first of three Beatles EPs was released on this day. Simply titled The Beatles, it was issued in mono by the Vee-Jay label as VJEP 1-903.
A single, Do You Want To Know A Secret, was released on this day in the USA.