A host of Hollywood heavyweights hit Boston yesterday, gathering at friendly Fenway for a screening of Ben Affleck’s latest film, “The Town.’’ The movie’s A-list cast — Affleck, Jon Hamm (who brought his longtime girlfriend Jennifer Westfeldt), Jeremy Renner, Rebecca Hall, Chris Cooper, and Blake Lively — all made the scene, and walked a red carpet in front of the first base dugout. The surprise guest of the night was Matt Damon, who brought his pregnant wife, Lucia, his mom, Nancy, his dad, Kent, his stepparents, and his brother Kyle.
