Limping along in live 4/8 game

[GreywolfNYC]

Playing in a NYC cardroom that I haven't been in before. Only had about 2 hours to play so I took a seat in their 4/8 game.
One other very solid 2+2er who was not involved in this hand. A couple of decent players and the rest are, well, donkeys.
UTG limps, three others follow, I limp in the CO with Q [img]/images/graemlins/spade.gif[/img]9 [img]/images/graemlins/spade.gif[/img]. The button folds, the SB folds, and the BB raises. (N.B. The BB here was the biggest donator at the table). We all call and 6 see the flop.
Flop comes A [img]/images/graemlins/spade.gif[/img]K [img]/images/graemlins/spade.gif[/img]7 [img]/images/graemlins/club.gif[/img].
The BB bets, UTG calls, the other three drop.
What's my play here and why?