I saw a couple of instances last weekend...no MC-just a clock on the wall. One song finished with two minutes left, so the group says "We've got time for one more." So they give a 1½ min. intro, do another minute tuning and making remarks...THEN do a 3 minute number...THEN begin packing while the next group, who has 30 minutes alloted, tries to find a place to set up. (THEN stand in the wings chatting loudly)

Simply rude.