Early Saturday, as a live reggae band sampled songs like “Lovely Day” by Bill Withers and “September” by Earth, Wind and Fire, Rise Dispensary, a Silver Spring, Md., medical cannabis retailer, opened its doors to a line of customers eagerly waiting under a green tent. Khiry Mayberry, a 27-year-old working security detail at the dispensary, greeted them, asking about their days and what products they were looking for.
