Here's what's going on today (Saturday, March 24): The most hotly-anticipated show of the Savannah Music Festival is tonight at the Trustees Theater - singer/songwriters Lyle Lovett and John Hiatt, intimate and acoustic at 8 p.m. It's been sold out for weeks. Violinist Daniel Hope leads a chamber music ensemble, with Menahem Pressler, at the Telfair Academy at 6 p.m. Ruthie Foster (incredible blues singer) and the Campbell Brothers (sacred steel) play the Morris Center at 6:15. And, of course, the David Mamet comedy November continues at 8, at Muse Arts Warehouse.