The BDN is making the most crucial coverage of the coronavirus pandemic and its economic impact in Maine free for all readers. Click here for all coronavirus stories. You can join others committed to safeguarding this vital public service by purchasing a subscription or donating directly to the newsroom.BELFAST, Maine — For a quarter century, musician Ando Anderson has filled downtown with the sounds of bluegrass, rock-and-roll, folk, jazz and more during Belfast Summer Nights, the weekly outdoor summer music series he founded. But this spring, Anderson was in a funk as he despaired how to make the event both safe and fun in the era of the coronavirus pandemic. “I didn’t know that we were going to be able to have it,” he said, adding that he and co-organizer Annadeene Konesni Fowler thought of idea after idea, but none stuck.