Massive pot, tight spot - TS 15/30

[alleatoryage]

Ok, this is Turning Stone 15/30. Seems like an insane game.
I have only been in for about one rotation, so no huge reads except that things can get very LAGgy.

Hero has A [img]/images/graemlins/spade.gif[/img]K [img]/images/graemlins/spade.gif[/img] UTG and raises.
UTG+1 cc.
UTG+2 three bets.
MP1 cc
MP2 cc
CO cc
Button cc
blinds fold
Hero caps
All call.
(This just about blew my mind - hero plays a lot of internet 6 max and is now virtually clueless about how to handle this nonsense)

Flop:

9 [img]/images/graemlins/club.gif[/img]9 [img]/images/graemlins/diamond.gif[/img]3 [img]/images/graemlins/heart.gif[/img]

Hero bets, folded to MP1 who calls, folded to button who calls

Turn: A [img]/images/graemlins/diamond.gif[/img]

Hero bets, MP1 raises, button folds, Hero Calls (?)

River: 7 [img]/images/graemlins/club.gif[/img]

Hero checks, MP1 bets, Hero calls

thoughts?

Give the huge pot size, I don't think I played this one horribly, but I seems that with two calls on the flop, I was probably cooked.

How many of you fold the turn?