It was a Sunday.
Monday. I saw The Beatles live the following Sunday, Sept 13, 1964 in Baltimore, MD.
Sept. 13, 1951 was on a Thursday.
Sunday
Monday
It was a Tuesday.
13 October 1964 was a Tuesday.
July 13, 1964 was a Monday.
It was a Monday!
January 13, 1964 fell on a Monday.
13 February 1964 was a Thursday.
April 13, 1964 fell on a Monday.
Wednesday