By Denny Dyroff, Entertainment Editor, The Times If you’re in the mood for a lot of music this weekend, then you should head north — to Old Pool Farm in Schwenksville to check out the 2019 Philadelphia Folk Festival (Old Pool Farm, Schwenksville, 800-556-FOLK, www.pfs.org). This Philadelphia Folk Festival is a music festival that is on a plateau all its own. Now in its 58th year, the festival...