Chicago based singer-songwriter Joe Jencks and conservatory-trained Maine music-maker Randall Williams will perform during a Folk & Acoustic House Concert at 8 p.m. Saturday at the Rockville home of Cheryl Kagan and David Spitzer. Doors open at 7:30 p.m. Information and directions will be sent to those with confirmed reservations. Suggested donation is $20, with 100 percent of the funds going to the performers. For more information, call 301-424-2161. Visit www.JoeJencks.com or www.WhereIsRandall.com.