MARYSVILLE UNDERGROUND
-Descend into darkness-
Marysville, CA
Oct 31 & Nov 01
The Event
Beckwourth Riverfront Park
Oct 31 - Nov 01
12 to 11 pm
With five haunting attractions, live horrors, and immersive entertainment for all ages, this event is no ordinary Halloween party. This is where nightmares breathe… and legends hunt.
The Game of Ariadne (Ages 13+)
A test of wit, nerve, and survival.
Each challenger receives a flag belt upon entry. Lose your flags, lose the game. Keep them through all three terrifying trials and earn a prize that proves you're more than just human.
Attraction 01: The Labyrinth (Ages 13+)
15,000 square feet of dark, suffocating maze. Twisted creatures roam the corridors. You must gather ancient clues while being hunted. No one escapes unchanged.
Attraction 02: House of Horror (Ages 13+)
A deranged slaughterhouse… with 10 rooms stitched together by madness. Solve the story, uncover the villain — or lose another flag to the horror that waits in the walls.
Attraction 03: Zombie Escape (Ages 13+)
An open arena. 40,000 square feet. The air is thick with death. The undead are hungry — and you’re the last course. Run. Hide. Survive.
Few make it to the end with all flags. But those who do… are rewarded.
-Other Attractions-
Attraction 04: Monster Mash
The only “safe” zone… but even here, something lurks.
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Live performances echo through the night
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Dark photo booths offer one last smile before the scream
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Watch live-streams from within each main attraction
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Vendors & drinks serve up sinister delights
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Themed beer garden (21+) is your last escape from reality
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Backyard Games to mask the traumas endured
Attraction 05: Little Monsters
Not all monsters bite. This haunt is tailored for those under 13, with creepy-fun vibes, haunted bounce houses, eerie photo booths, and a Halloween treat trail for the brave little beasts.
Partners
Beneath the trembling earth of Marysville, where whispers of the damned echo, the Marysville Underground binds the community—residents, businesses, nonprofits, and shadowy organizations—in a pact of terror. For 2025, October 31 & November 1, we beckon you to join this dark alliance through Sponsorships, Vendor stalls, and Entertainer Partnerships, each a thread in the web of our subterranean nightmare.
Partner Opportunities
Sponsors
Starting at $0
Dare to etch your name into the abyss! Whether you seek to advertise amidst the screams, earn blood-soaked profits by selling tickets, or craft your own business-themed “scare” within our cursed attractions, the Underground has a plan just for you.
Vendors
Starting at $250
Vendors may claim a 10x10 tented lair for $250, granting access to both days to peddle wares under the watchful eyes of the dark. Contact us to secure your place in the shadows.
Entertainers
Contact for details.
Amplify the terror for our trembling guests! If your attraction, skill, or twisted concept can deepen the dread—be it a macabre performance or a chilling display—reach out by clicking below. The underground hungers for your darkness.
Request info for Partners
Employment Opportunities
Dare to awaken the abyss? The Marysville Underground summons temporary employees to conjure its terror—haunting the setup, commanding the shadows of the event, embodying our cast of monstrous fiends, and burying the echoes of screams during cleanup, all from October 25 to November 3, 2025, at Cotton Rosser Arena in Marysville, CA.
Information
