Ben Affleck was in a relaxed mood at a party for new movie “The Heat” on Sunday at Stone Rose Lounge. We’re told Affleck arrived solo and spent most of the night hanging out at the bar at the C. Wonder party, doing shots and chatting up New Kids on the Block’s Joey McIntyre, who is also from Boston. “Ben was heard talking about doing location scouting for his movie ‘Live by Night’ while he’s in the city,” said the source. A second witness said Affleck joked to another guest in the business, “Do you want to run my production company?” Stars Melissa McCarthy and Sandra Bullock attended an earlier screening, along with Brooke Shields and Megan Hilty.