In short, each year, Cantillon puts out a special beer that is tapped around the world all on one special day; Zwanze Day. It's only on tap, though I believe they do bottle a little bit that's only available at the brewery. Each year tends to be a different beer than years past, which makes going to one of the designated places to try it all that much special. Plus, at least it is for the Chicago location, most places will also break out some other special beers either on tap and/or in bottles. It's a cool experience to be had and I'd highly recommend going to the closest location if you have the time.

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