Attendees of the upcoming Great American Beer Festival in Denver should check out the “Collaborative Evil” event in the Brewers Studio Pavilion, September 24 at 6:30 p.m.

What is Collaborative Evil? Steve Altimari, the brewmaster at Valley Brewing, explains the concept: Nine brewers (mostly friends and acquaintances) have agreed on a style (Belgian golden strong ale) and some basic parameters and limitations they wanted to follow (that “it be not loaded with spices, be fairly dry in finish, and … that each brewer would choose a secret sugar ingredient to differentiate the beers from one another”), and have all made different versions of the beer to pour at the festival.

The whole thing has been put together by Todd Ashman of FiftyFifty Brewing Company, and this is the second year he has organized a collaborative beer for the Festival. In 2008, the Collaborative Evil project only included three breweries, but all of them received A- or better reviews on BeerAdvocate. It will be interesting to see how this year’s batch of brews comes out.

(As well as FiftyFifty and Valley, the other collaborators are: Sacramento Brewing, Fat Head’s Brewery and Saloon, Flossmoor Station, Oakshire Brewing, Silver Peak Brewery, Speakeasy Ales & Lagers, and Lucky Bucket Brewing).

If all that isn’t enough to get you interested, how about the sweet metal-esque label art (pictured). Ashman commissioned it, and is also responsible for the name, an extension of a beer called “Evil” he was brewing. The art covers all your metal basics, and would look pretty awesome painted on the side of a van. “No, we are not all metal heads,” claims Altimari, while Ashman explains that “we’re trying to have fun with this … the beer, the GABF tasting, and working together of course.”

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