ILEA Monster Mash is a trick-or-treat event at International Museum of Surgical Science in Chicago, IL, on Thursday, October 29 from 5:30 PM to 8:30 PM. That's 2 days before Halloween. Costumes are part of the fun. It is listed as family-friendly. Chicago has 85 other Halloween events within three days of this one.
Thursday, October 29 · 5:30 PM – 8:30 PM
UTC-05:00International Museum of Surgical Science | Chicago, IL
International Museum of Surgical Science, 1524 N Lake Shore Dr,Chicago,IL,United States
It is on Thursday, October 29, 2026, from 5:30 PM to 8:30 PM, 2 days before Halloween.
It takes place at International Museum of Surgical Science, 1524 N Lake Shore Dr,Chicago,IL,United States.
Yes, it is listed as a family-friendly Halloween event.
Yes, costumes are encouraged.
It runs for about 3 hours, from 5:30 PM to 8:30 PM.
2527 Green Bay Rd, North Chicago, IL 60064-3012, United States
1908 S Millard Ave
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