Some events require advance registration or reservations; call ahead to confirm.

Crazed Carnival A fun house of “mazes, clowns, and other surprises.”

No-Scare Halloween Fest and Maze a 6-8 PM, Athletic Field Park, 3546 W. Addison, 312-742-7529, $2 for children eight and under.

Spooky Seas Scary sea stories highlight this slumber party featuring trick-or-treating, a DJ, and a costume parade. a 6-10 PM for evening event alone, 6 PM-9 AM for overnight stay, Shedd Aquarium, 1200 S. Lake Shore Dr., 312-692-3333, $30 evening, $60 overnight, children two and under free, but only children five and over may stay overnight.

X-ecutioner’s Ball a 7 PM-4 AM, Excalibur, 632 N. Dearborn, 312-266-1944, excaliburchicago.com, $20.

Crazed Carnival See also Fri 10/27. a 6:30-9:30 PM, Lincoln Park Cultural Center, 2045 N. Lincoln Park West, 312-742-7726, $5, 10+.

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Hallowed Halls: Magic, Music, and Make-Believe Family-oriented annual event, including hat-making workshops, a costume parade, magicians, and music. a 10 AM-3 PM, Chicago Cultural Center, 78 E. Washington (enter at 77 E. Randolph), 312-744-6630. F