Friday, October 24, 2025 - 7:00pm to 10:00pm

Get ready for a frighteningly good time!

Join us for our Monster Mash—a Halloween party like no other, exclusively for adults 21 and up.

Enjoy a spine-tingling lineup of activities, eerie entertainment, creepy competitions, Halloween classics reimagined, and more ghoulishly good times as you explore the museum…after dark.

Sci-tacular highlights include:

  • Costume Contest: Strut your creeptastic costume in solo or group categories!
  • Flashlight Ghost Tours: Brave the shadows to discover secrets lurking in dark corners.
  • Celebrity or Serial Killer?: Test your knowledge of the infamous.
  • Liquid Nitrogen Ice Cream: Enjoy a sinisterly good icy treat made before your eyes.
  • Skeleton Dance-Off: Show off your best moves with a bony partner—an actual skeleton!
  • Final Girl: Uncover the morality of horror movies.
  • Mummy Relay: Race to wrap your way to victory!
  • Dino Gore Show: Horrifying deaths from the fossil record.
  • Mini Pumpkin Decorating: Enchant us with your Halloween creativity.
  • Halloween in the Acheson Planetarium: A cosmic twist on seasonal chills.
  • Stargazing at the Observatory: Peer into the unknown…if you dare.
  • Haunting Memories: Get your boo-tiful picture taken with free professional photos!

And that’s just the beginning…

Food & Spirits
Enjoy Halloween-themed bites and devilish drinks (available for purchase), including specialty cocktails brewed just for the occasion.

Costumes Encouraged
Whether you go full vampire glam, undead chic, or mad scientist style, this is your night to dress to distress. Show off your most creative—or chilling!—look for a chance to win our costume contest. Group and individual entries welcome! Not into dressing up? No problem—your presence is the real treat.

Tickets
$29 for members, $35 for non-members, and $40 (member or non-member) at the door. Pre-registration is strongly encouraged and closes Thursday, October 23 at 5:00 pm. Tickets are nonrefundable.