The Metropolitan Opera’s (known as the MET) English-language version of Mozart’s enchanting masterpiece, “The Magic Flute,”is slated for this evening. It will be shown live in high definition(HDL). Tickets are $20; $10 for teachers; and free for students. They are on sale at Medicine Shoppe (Havensight), Frenchtown Deli, Chelsea Drugstore (Red Hook) and Antilles School Administration Office. Also online at instantseats.com. Small meals, wine, water, tapas and dessert from Amalia Café will be served starting one hour before and during intermission.