Fans of one-of-a-kind ales and hard-to-find brews will have their collective minds blown when famed Delaware brewery, Dogfish Head, takes over the taps at Foundry on Elm. On Thursday, May 15th, they’ll be offering eight rare brews, some of which have never seen the light of day and other one-offs they’ll never make again. It’s a beer aficionados dream night. The Occasional Rarities collection includes Olde School Barleywine, Chateau Jiahu and Black & Blue, among others. The taps will start flowing at 6:00pm and Foundry’s dinner menu, courtesy of chef Alex Jenkins, is available all night. For more information, call Foundry on Elm at 617.628.9999.