The Dance Party is part of the show and most are still in character, dancing and spreading the love. They are very friendly but I am not sure if it is appropriate for them to sign at that time. Most wait for them to come out at the stage door, by the way, there was a good sized crowd waiting for them to come out after Wednesday's Mat. You can check out some stage door pictures on Hair's Face Book page.
i must've misread that. i thought the question was just about the stage door.
as far as the stage they are approachable and depending on the show and time (i was there on a thurs. night) and sat on the stage and spoke to Caissie for a little bit. i also agree..wait until stage door for everything else.