“The hottest acoustic Irish band on the planet” (Irish Echo) makes its annual return to the Camden Opera House, 29 Elm St., to welcome the season with traditional Irish music. Cillian Vallely (uilleann pipes and low whistle), Kevin Crawford (flute, whistles and bodhran), Trevor Hutchinson (standup bass), Colin Farrell (fiddle and whistle), Patrick Doocey (guitar)and special guest Dave Curley will fill the House in a concert sponsored by Camden Maine Stay Inn and 40 Paper. Choose-your-own-reserved-seat tickets are $48 in advance, $54 day-of-show via camdenoperahouse.com.