Found by AroundTheSunBlog.com who gives a weekly list of free things to do in Portland on weekends.
Over 50 breweries and brewpub statewide will open their doors to beer lovers for the 3rd Annual Zwickelmania. It’s a free statewide event put on by the Oregon Brewers Guild that gives the beer community a chance to to tour, taste, and meet the brewers.
Saturday, February 19th, 11- 4pm
An exhaustive list of locations, organized by regions, is found here as well as more information on the breweries and what they are offering. There are also shuttle buses.