Halloween: The new hot ticket?

The brokerage Halloween Party may be replacing the holiday party as the new hot ticket.

Last month, both Douglas Elliman and Nest Seekers International hosted extravagant masquerade bashes.

Douglas Elliman agents donned 1920s attire and flooded into Atlantic City for a firm-wide “Great Gatsby”–themed masquerade ball.

The ball marked the conclusion of the company’s fourth annual “ReInvent” convention — a networking and education event which drew 1,000 Elliman pros — held this year at the Borgata Casino and Spa.

Actor Kevin Spacey — whose classic 1992 movie “Glengarry Glen Ross” depicts four real estate salesmen — made a special appearance at the ball. He addressed the crowd, saying he, too, had thought about “reinvention” in his own career, having starred in the Netflix-only show “House of Cards.”

Spacey, whose film played on a constant loop throughout the three-day event, also singled out Elliman super-broker Raphael De Niro, son of actor Robert De Niro, in his speech, joking that if De Niro’s team had convinced “Goodfellas” actor Joe Pesci to join their group, Spacey “would definitely buy a fucking apartment.”

As if that weren’t enough, Elliman CEO Dottie Herman and Chairman Howard Lorber took the “masquerade” part of the ball seriously.

Herman wore a white tasseled gown, feather boa and red wig, while Lorber donned a pinstriped suit and fedora. “It was very exciting to see Howard Lorber dressed up as a gangster with an automatic weapon in his hand,” said Elliman agent and “Million Dollar Listing New York” star Luis D. Ortiz.

The Nest Seekers bash, at the Finale nightclub at 199 Bowery, also drew a handful of flappers, gangsters and jazz fiends paying homage to Gatsby. But there were also a host of other costumes including a boa-clad Muammar Gaddafi, Alice in Wonderland, a bumble bee, Peter Pan, and Madonna.

CEO Eddie Shapiro, dressed in a ruffled shirt and rhinestone-studded loafers, said he threw the bash to avoid competing with the inevitable crush of holiday parties later in the year. And the event was no staid corporate affair: Performers in “Black Swan” costumes pirouetted on the dance floor and a Spandex-clad contortionist twisted on a raised platform.

But one guest was conspicuously absent. “Million Dollar Listing New York” star and Nest Seekers top producer Ryan Serhant didn’t show: he was busy filming his part in Noah Baumbach’s next movie, “While We’re Young.”