I've created a boosting session JUST for the Carnival achievement (Blend in with the crowd for 3 minutes in a game of Manhunt in the Siena map).
The boosting session is for tonight (Sunday Feb 24) at 10:30pm Eastern time zone. I would appreciate it if anybody who needs that achievement joins up. We need a minimum of four.
If you do not officially join the boosting session above (i.e. you don't have a TA.com account) then feel free to post here and then send me a message on XBL.