Guest Night was a British television programme which aired on the BBC from 1938 to 1939, with an additional set of episodes made in 1946. According to a contemporary account, it was similar to a radio programme called Men Talking. (see page 83 of PDF file).
The series was hosted by A.G. Street, with each episode featuring a meeting of guests from a particular field.
None of the episodes still exist, as methods to record live television were not developed until late 1947, and were used very rarely by the BBC until around the mid-1950s.