For those in central/eastern MO this weekend is the Augusta Bottoms Beerfest in, obviously enough, Augusta MO. Admission is $25. Several of the breweries participating: schlafly, tin mill, AB michelob spec. lagers, augusta, square one, boulevard, and a few more. Its from 12-5 I believe and should be well worth the commute.
http://www.augustabottomsbeerfest.com