Improvised performance in WI event? (3,7)
I believe the answer is:
jam session
'improvised performance' is the definition.
(I've seen this before)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for jam session that I've seen before include "time for a sarnie?" , "improvised performance" , "jazz performance" , "Gathering of jazz musicians" , "playing of improvised bebop?" .)