I was listening to a couple of old vinyls of mine recently. One was a "Bud & Travis in Concert" album, the other a "Kingston Trio at the Hungry i." In both cases, you could hear ice clinking in glasses and calls for songs not in the repertoire of either group (Play Melancholy Baby!!) Travis responded to one heckler by saying "We did have a couple of requests for Harbor Lights," which got the heckler heckled. Dave Guard suggested that the group "suck on ice cubes in 4/4 time." The recipe calls for more up-tempo songs and a willingness to forge ahead no matter what happens. The late Tom Clancy once called out, after hearing a beer mug hit the floor, "Hit 'im again quick, lad!" A good sense of humor won't hurt, along with a thick skin. Above all, don't allow yourself to get caught up in a "last word" pissing contest with a heckler.