Each time a Hogwarts letter goes undelivered in “Harry Potter and the Sorcerer’s Stone,” audience members will throw a paper airplane, then pick one up to throw later.

It’s just one of the audience actions in the Harry Potter Movie Experience script for Milton Public Library’s Tuesday, Feb. 27, interactive screening of the film.

Middle school kids in 5th to 8th grade are invited to follow the movie with the script, and participate with the props provided.

The free program is from 5:30 – 7:30 p.m.  To register, call the library at 802-893-4644.

Photo: The Golden Snitch, often called simply the Snitch, is the third and smallest ball used in Quidditch.  Moviegoers will receive a Snitch like the one pictured.