Medford resident Alex Cumming and three colleagues conclude the daylong Virtual Accordion Camp with a virtual accordion concert. Cumming, music director at Unitarian Universalist Church of Medford, is a traditional singer, accordionist, pianist, and dance caller who has made his mark on the folk scene with his rhythmic, dance-able accordion style. He will be joined by Virtual Accordion Camp co-founders Jeremiah McLane and Rachel Bell, plus the legendary UK accordionist Karen Tweed. The concert will be live-streamed on the Virtual…