By Beer Columnist Donavan Hall Put this on your calendar! Firkin Friday at Deks in Rocky Point will feature a firkin of cask conditioned Oatmeal Stout from Blue Point Brewing Company. The cask will be tapped at 9 p.m. on Friday, September 28, 2007. If you never had cask conditioned ale, now’s your chance. If you love cask conditioned ale already, come on out and join us. Cask conditioned ale is a young beer. The brewing process for the ale is the same, but just as the primary fermentation slows, the beer is transferred from the fermenter to a cask…