Double bill at the Nassau Coliseum in Uniondale, Long Island.
Frank Zappa/Sha Na Na double bill. You read that correctly.
This ihappened around the time of "Apostrophe", long before his audience would expand due to the inexplicably popular "Valley Girl".
Suffice it to say that Sha Na Na was awful, the Coliseum was empty and cold, and Zappa played for about 45 minutes. Maybe. Or an eternity - take your pick.
Truly the worst concert I'd ever attended.