Last year saw "Hometown Girl" Mary Chapin Carpenter return to Wolf Trap for the first time in five years, and for the first time since recovering from a "serious medical issue that necessitated significant rest." This year, she'll return -- with special guest, legendary folk-rocker Loudon Wainwright III (dad to Rufus). And the concert's on a Saturday night, no less. It can't get much better. Saturday, Aug. 27, at 8 p.m. Wolf Trap, 1645 Trap Road, Vienna. Tickets are $25 to $42. Call 703-255-1900 or visit wolftrap.org.