I just talk to them while I'm playing if the song I'm doing allows it....they think your a "DJ" so they come up to talk to ya like they would a DJ.
Anoher reason besides many why I can't use a headset Mic when I perform. If Im busy during a song I just Ignor Them & they'll get the message and stand on the side and WAIT till I can get to them....if not they will get the message and go back to their seat and come back later, or return with a note. Its all part of ENTERTAINING!