Part of Portland Parks & Recreation’s Summer Free For All. Summer Free For All events are free and everyone is welcome. Plan an evening of music with family and friends — bring chairs and blankets, pack a picnic or purchase something tasty from the local food vendors on site. Learn more about this event here. The Mel Brown B-3 Organ Group, called “Jimmy Mak’s signature band” by The Oregonian, performed on Thursday nights for 20 years at the noted Pearl District music venue. That’s a remarkably long run, but the band’s roots extend back even further than its September 1997 debut at Jimmy Mak’s. In 1997, most Portland music fans were familiar with Mel Brown as the dean of Portland jazz drummers and for his earlier stint as…