NEW YORK (TheStreet) -- What are you doing this Halloween? If you're like a growing number of people, you might go to an "underground" party.

For the first time in six years, Halloween falls on a Friday, and hip people all over the world will be spending the holiday at underground parties, sometimes called "raves," often held illegally in warehouses, on rooftops and in other ad hoc event spaces. These parties often have hundreds or thousands of people and feature some of the most sought-after music acts in the world.

Once the sole province of an in-the-know crowd, these parties have gone above ground. Output, a club that opened in the hipster-filled Brooklyn neighborhood of Williamsburg in January 2013, regularly hosts parties that would have been held in shady, illegal spaces just a few years prior, and they often rage until 6:00 A.M. No special knowledge is needed for entrance, just a ticket. Verboten, another club that opened across the street from Output in April 2014, is owned and operated by the husband and wife duo that ran an underground party outfit of the same name in New York for the past ten years. It's also open to the public. 

Perhaps the ultimate sign that the underground has been unearthed is an article in the New York Times. The latest popular rave is one thrown by New York City nightlife personality "Ladyfag." Miley Cyrus showed up at the last one, according to the Times. Anyone with a ticket can show up at the next one. 

Here are 17 crazy Halloween parties that you've never heard of (but should try to attend). TheStreet culled them from various sources including Facebook, Twitter and Resident Advisor, a site that lists such events. Many are already sold out and the rest soon will be, so click through to find out which ones are happening near you and get a ticket while you can.

Ladyfag + Seva Granik Present: SHADE SAVES

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Starts: Friday, October 31, 11:00 PM
Ends: Unknown

Location: New York, secret location, to be announced to ticket-holders the day of the party

Tickets: Sold out

Blood Moon Halloween

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Starts: Friday, October 31, 9:00 PM
Ends: Saturday, November 1, 4:00 AM

Location: Los Angeles, secret location, to be announced to ticket-holders the day of the party

Tickets: $20

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A Life and Death Halloween Showcase, Produced by Cityfox

Starts: Friday, October 31, 10:00 PM
Ends: Saturday, November 1, 8:00 AM

Location: New York, secret location, to be announced to ticket-holders the day of the party

Tickets: Sold out

Bang On NYC - Warehouse of Horrors

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Starts: Friday, October 31, 10:00 PM
Ends: Saturday, November 1, 6:00 AM

Location: New York, secret location, to be announced to ticket-holders the day of the party

Tickets: $70 to $120

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Robot Heart

Starts: Unknown
Ends: Unknown

Location: New York, secret location, to be announced to ticket-holders the day of the party

Tickets: by invite only (you have to ask for one here)

Paradigm Presents Halloween 2014

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Starts: Friday, October 31, 10:00 PM
Ends: Saturday, November 1, 4:00 AM

Location: Chicago, Lacuna Artist Loft Studios

Tickets: $60

Regression Sessions - The Haunted Forest

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Starts: Friday, October 31, 10:00 PM
Ends: Saturday, November 1, 6:00 AM

Location: London, Studio 338

Tickets: Sold out

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Found Horror Series

Starts: Friday, October 31, 9:00 PM
Ends: Saturday, November 1, 6:00 AM

Location: London, Troxy

Tickets: £22.50

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Krankbrother Presents Halloween

Starts: Friday, October 31, 10:00 PM
Ends: Saturday, November 1, 7:00 AM

Location: London, Pulse

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Tickets: £27.50 to £30.50

The Hydra: Full Pupp 10 x Horse Meat Disco

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Starts: Friday, October 31, 10:00 PM
Ends: Saturday, November 1, 6:00 AM

Location: London, Studio Spaces E1

Tickets: Sold out

The Mexican Death Disco

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Starts: Friday, October 31, 10:00 PM
Ends: Saturday, November 1, 6:00 AM

Location: London, iCAN Studios

Tickets: £27.50

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Pumpkin Electronik Barcelona

Starts: Saturday, November 1, 12:30 AM
Ends: Saturday, November 1, 6:00 AM

Location: Barcelona, Nitsa

Tickets: €18.00

Paranoia

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Starts: Friday, October 31, Midnight
Ends: Saturday, November 1, 10:00 AM

Location: Berlin, ://about blank

Tickets: at the door

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Mister Halloween Night and The Masonic Temple Of Doom

Starts: Friday, October 31, 9:00 PM
Ends: Saturday, November 1, 3:00 AM

Location: New York, Brooklyn Masonic Temple

Tickets: Sold out

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Verboten Halloween

Starts: Friday, October 31, 11:00 PM
Ends: Saturday, November 1, 5:00 AM

Location: New York, Verboten

Tickets: $50

Boo Yourself

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Starts: Friday, October 31, 10:00 PM
Ends: Saturday, November 1, 5:00 AM

Location: New York, Output

Tickets: Sold out

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Wizardry Halloween Special

Starts: Friday, October 31, 11:00 PM
Ends: Saturday, November 1, 5:00 AM

Location: Miami, Trade

Tickets: $30


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