I find both City Paper and NEXTpittsburgh do a solid job of highlighting things like that. As to specific events, besides Handmade Arcade, we really love the Westmoreland Arts & Heritage Festival at the end of June.
I'm not sure if craft shows (soap and knick knacks) are what you're actually after, but I Made It markets holds events throughout the year (and today/Saturday)
VietBongArmy t1_j0i9rf9 wrote
You just missed Handmade Arcade in the beginning of the month