PhillyVoice.com Drink cask ale at the annual Yards Real Ale Invitational PhillyVoice.com The Yards Real Ale Invitational will return to Yards Brewing Co. on Sunday, May 1. During the all-day drinking event, more than 50 firkins of cask-conditioned beer will be available to try. Breweries from all over the world will be sharing their .. ...