Accordion maestro Dan Possumato, guitarist and vocalist Jim Hyland, and tin whistle player Jody Johnstone return to fill Camden Opera House, 29 Elm St., with traditional tunes. Choose your own reserved seat tickets are just $10 in advance, $15 day-of-show, at camdenoperahouse.com. Doors open 7 p.m. Sponsored by 40 Paper. FMI: (207) 236-3154.