Action and mythology collide in the fast-paced “Percy Jackson and the Olympians: the Lightning Thief,” based on the books by Rick Riordan. Northfield Public Schools Community Services will show the movie at 7 p.m. on Friday, April 8 in the Northfield High School Auditorium. Doors will open at 6:30 p.m. The movie is rated PG. There is a $2 suggested donation with proceeds going to support youth programming and scholarships.