It’s down to the final two brews in Philly Beer Week’s 2015 #BeerMadness competition. Tonight, head to Field House (1150 Filbert St.) from 6 to 9 p.m. for the official Keg Off. The competitors vying to be crowned #BeerMadness champ are Dogfish Head 90 Minute IPA and Bell’s Two Hearted Ale. Vote for your favorite of the two at http://beermadness.phillybeerweek.org. The winning beerwill be decidedbased on votes and bar sales. The #BeerMadness tournament started last month with a beer bracket of 32 craft beers. It’s one of several events leading up to the ever-expanding Philly Beer Week, taking place May 29 to June 7.