A green festival principally designed for adults, Muddy Boot makes a good effort to keep children entertained as well.
Hmmm. Perhaps this is a thing of the past - it ran in 2010 and 2011, but there was no sign of it in 2012 or 2013 and no announcement for 2014. Let me know if you know otherwise!
2408 SE 16th Ave Portland, OR 97214 [Google map].