I always go to Fat Tuesdays before events at the patriot center and I like it. I park and walk across the street so i don't get stuck in taffic plus i don't have to risk driving anywhere after a whole lot of drinks. Their happy hour isn't bad and I think it goes till 7. Food is expensive but I hardly ever eat there. Gets kinda crowded depending on the show so sometimes you have to get there early for a table. Brions grille is across the street too and their food is better but drink specials aren't as good.
As for all the other bars mentioned I wouldn't go to them before a show since they aren't within walking distance and for some reason cops love drunk people.