There will be a huge outdoor beer festival taking place on the Rhine river front just outside the old town of Mainz from July 18 to the 20th. I've been there several times before, it's an annual event with fireworks, live music etc. You can select from 400 different brands of beer from all over the world and compare them. More information is available but in German only: http://www.bierboerse.com. The same event will also take place in Düsseldorf and downtown Frankfurt later during the summer!
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