Costume and party enthusiasts delight every autumn as Halloween celebrations transform the pedestrian into the uncanny. The candy-coated holiday falls on a Saturday this year, yielding two horrifying nights of masked carousing.
• Join locals to hear true accounts of Atlanta's paranormal activity at the Darkside Tours at Underground Atlanta. $25-$30. Fri., 8 p.m. 50 Upper Alabama St. 404-523-2311. www.underground-atlanta.com.
• At Centennial Olympic Park, Scream on the Green screens Harry Potter and the Sorcerer's Stone, followed by trick-or-treating. Free. Sat., 5 p.m. 200 Centennial Olympic Park Drive. 404-222-7275. www.centennialpark.com.
• The crew at Dad's Garage hosts the Halloweenus Wangdoodle variety show, a night of horrifying sketches, with the Great Humpkin dance party and costume contest after the show. $8-$23. Sat., 8 p.m. Dad's Garage Theatre, 280 Elizabeth St. 404-523-3141. www.dadsgarage.com.
• The Silver Scream Spook Show resurrects Bela Lugosi in the horror classic White Zombie. Free-$10. Sat., 1 and 10 p.m. Plaza Theatre, 1049 Ponce de Leon Ave. 404-873-1939. www.plazaatlanta.com.