The Opera House in Boothbay Harbor, 86 Townsend Avenue, will host “Mental Madness Show” on Thursday, September 19. Front-section seats are available for $35 from the box office. Advance, discounted general-seating tickets are $25 and available from the box office or by calling 633-5159. Regular tickets are $30 and available online at Doors will open at 6:30 p.m.; the show will begin at 7:00. Audience members must be at least 11 years old and accompanied by an adult. Magic Beyond Imagination — magicians Joe Maxwell (left) Garrett Thomas (middle), and Kozmo — have been hailed as three of the country’s greatest magicians.