Conversation so far:
Did The Beatles play in the US in 1964?
In February 1964, the Beatles arrived in the United States and their televised performances on The Ed Sullivan Show were viewed by approximately 73 million people.
What city(s) did The Beatles play in 1964?
The Beatles performed 30 concerts in 23 cities, starting in California and ending in New York. The opening concert was held on 19 August 1964 at the Cow Palace.
Was the The Beatles show a success?
The tour earned the Beatles over a million dollars in ticket sales, and stimulated a further increase in record and Beatles-related merchandise sales.
Where else did The Beatles play in 1964 besides California and New York?
The Beatles also played in Chicago and Jacksonville

Question: When did they meet Bob Dylan?
Self-contained rewrite: When did The Beatles meet Bob Dylan?