OMSI opens the museum to adults only for a Halloween-themed evening of science, with the full exhibit floor available without the daytime crowds. Programming includes interactive demonstrations built around the season, among them theremin music and ghost bubbles, along with planetarium shows, themed vendors, and tastings from local beverage makers. Food and drink are available for purchase and a happy hour runs from 5:00 PM before the main program begins at 6:00 PM. Costumes are encouraged, with the standard museum restrictions on weapons and non-removable masks. Attendees must be 21 or older and government-issued photo identification is required at the door. Held at OMSI, 1945 SE Water Ave, Portland. Ticketed; advance purchase recommended.
