A number of musicians are uniting for concerts to benefit Sweet Relief Musicians Fund, which aids needy musicians with healthcare needs. A concert Aug. 25 at The Trap will feature Carolyn Dawn Johnson, David Ball, Joy Lynn White, James Otto, Jeffrey Steele, Christy Sutherland and Jamie O'Neal. Billy Block will host. ... On Aug. 25 a concert at 12th and Porter will include Victoria Williams, Mark Olson, Julie Miller, Jason White, Will Kimbrough, Tommy Womack, Josh Rouse, Last Train Home and Jeff Black. Kim Webber will host. ... Additionally, John Mayer will donate a portion of the proceeds from his Aug. 27 concert at Starwood Amphitheater. ... On Aug.28, the Country Music Hall of Fame and museum will host a mixer to discuss healthcare issues in the music industry. It will be hosted by Dave Marsh of Rockrap.