It’s Thursday, Aug. 6, and here are five things to know in Montgomery County. Weather: There is a chance of showers and thunderstorms mostly after 5 p.m., according to the National Weather Service. Outdoor Concert in Derwood: Classic rock band Special Delivery will put on a free concert from 6-8 p.m. at Rock Creek Regional Park at 15700 Needwood Lake Circle in Derwood. Summer Concert at Glen Echo Park: At 7:30 p.m., Arty Hill & The Long Gone Daddys will put on a free concert at Glen Echo Park at the Bumper Car Pavilion. For the latest news and events in Montgomery County, stay with MyMCMedia.