Basically any Irish pub is built to cater to groups of people lingering at their tables for an entire night. That's kind of the whole point of a pub. Just make sure you're giving them some decent business, and not sipping a single drink over the course of 6 hours.

Personally, I go to Murphys Law in Pawtucket to play games a lot.

Open until 1am every day, cheap drinks and decent food.

Can get loud on Friday & Saturday nights, but you can still get a booth in the back that's isolated from the party crowd.