This is from Mutual's Bandstand USA, which was broadcast live on Saturday
nights from 8pm-10pm beginning in 1956.
In the notes to JMY 6402, Enrico Merlin places this session at an unknown venue
on June 30, 1958 (a Monday). The Sextet was booked at Washington's Spotlite Lounge
on June 10-15 (Tuesday-Sunday) and August 5-10 (Tuesday-Sunday); a broadcast is
known to have been made on Saturday, August 9. This is probably it.
The second half of 1958 was a very busy time for the Sextet: Café Bohemia, New York
(April 25-May 4); Storyville, Boston (May 5-11); Café Bohemia, New York (May 12-18);
Red Hill Inn, Pennsauken NJ (May 20-25); Spotlite Lounge, Washington DC (June 10-15);
Small's Paradise, New York (June 24-29); Newport Jazz Festival (Thursday, July
3, 8:30 pm); Montréal Theatre Maisonneuve (July 10, with other dates in Montréal
and Quebec City); Village Vanguard, New York (July 22-August 3); Spotlite, Washington
DC (August 5-10); Comedy Club, Baltimore (August 12-17); Randall's Island, New
York (August 23: Third Annual NY Jazz Festival); Showboat, Philadelphia (September
1-6); Persian Room, Plaza Hotel, New York (Tuesday, September 9); Modern Jazz Room,
Cleveland (September 15-21); Clarence's Blue Bird Inn, Detroit (September 23-28);
Apollo Theatre, New York (October 17-23); Spotlite Lounge, Washington DC (October
29-November 2); Village Vanguard, New York (November 4-16 -- Evans left the group
after this gig, and was replaced by Wynton Kelly); Town Hall, New York (Friday,
November 28, 8:00 and 11:00 pm) Mosque Theatre, Newark NJ (November 29); Howard
Theatre, Washington DC (December 12-18); Town Hall, New York (Saturday, December
27, 8:30 and 11:00 pm).