Worst: Only because of the venue, a bombed-out wreck of a place called the Metropol; in Berlin in 1984 or thereabouts. John Lee Hooker was playing. The crowd was generally behaved (except for the drunks and the shot-up heroin addicts). At one point in the gig, some drunk gently tossed a half-empty bottle of vodka up on the stage, which rolled around and came to rest against the bass drum.
Hooker turned over the solo he was playing to his guitar player, ended the tune, and berated the crowd for their stupidity.
No seats, filthy, absolutely run-down shithole of a venue.
Best: There are many, but the one I'll always remember was the celebration of life concert held in memory of Arnold Jacobs, preeminent tubist with the Chicago Symphony; in Chicago in December 1998. OH. MY. GOD. There have never been that many stellar brass players under one roof playing their balls off EVER.
And yes - some female brass players have BALLS. There were a few there, as I recall. Gail Williams, hornist with the CSO, for one.