Scare On the Square will begin when youngsters, dressed as ghouls and goblins, trick or treat the mer-chants on the Square from 11 a.m. to 5 p.m. The Ghosts of Marietta Walking Tour will have tours every hour on the hour from 6 to 10 p.m. The Scary-etta Trolley Tour will have a tour at 7 and 9 p.m. The Earl Smith Strand Theatre will have a screening of the movie “Psycho” at 8 p.m. Theatre in the Square will have a performance of “The Woman in Black” at 8 p.m. There will also be Scary-aoke in the Marietta Square, provided by Party Central, from 7 to 10 p.m. All activities will take place around or on the Historic Marietta Square. (770) 429-1115.