The schedule for the 53d annual Philadelphia Folk Festival, to be held Aug. 15 to 17, has been announced. This year's fest takes place at the Old Pool Farm in Upper Salford near Schwenksville. The multigenerational attractions include Nashville string band Old Crow Medicine Show, sharp-witted songwriter Loudon Wainwright III, blues woman Shemekia Copeland, folk trio the Lone Bellow, folk duo JohnnySwim, veteran singer-songwriter Janis Ian, New Orleans strutters the Rebirth Brass Band, Celtic rockers Tempest, bluegrass band Steep Canyon Rangers, Ukrainian folk band DhakhaBrakha, Texas tunesmith Sarah Jarosz, and Nova Scotia fiddler Natalie MacMaster, among many others. As ever, WXPN-FM Folk Show DJ Gene Shay will host and tell knee-slapping jokes. Tickets and details: www.pfs.org.