By Donavan Hall, Beer Columnist The next Firkin Friday at DEKS is coming up soon; it’s this Friday, the 18th. A firkin of Green Flash Hop Head Red is on its way from Vista, California for our cask conditioned drinking pleasure. Hop Head Red is "a deliciously full-bodied and appropriately hoppy ale," according to Celebrator Beer News. It earned the silver medal in the American-Style Amber/Red Ale category in the 2007 Great American Beer Festival, the USA’s oldest and most prestigious craft beer competition. As far as I can tell, this may be Hop Head Red’s Long Island premier (in…