The current forecast calls for 15 degrees on Sunday. Puck drops at 2pm, and the game should be over (barring overtime) between 5pm & 6pm.
THE NHL'S FINAL FOUR: Western Conference Final: Calgary Flames lead San Jose Sharks 2-0 [Game 3: Thursday] Eastern Conference Final: Tampa Bay Lightning & Philadelphia Flyers are tied 1-1 [Game 3: Thursday]
I think the rest issue is sometimes overstated in hockey. The tired teams lose just as much as the team that has been resting too long and is suddenly rusty. Plus, the Stars are the decided underdogs and can play like they have nothing to lose.