Listed in a monthly financial report, the amount is itemized as expenses for meals at Voyeur West Hollywood.
RNC spokesman Doug Heye said Monday the committee doesn't know the details of how the money was spent, all who may have attended or the nature of the outing, except to say it was an unauthorized event and that the expenditure was inappropriate.
The RNC will be reimbursed by Erik Brown of Orange, Calif., the donor-vendor who billed the committee for the club visit, Heye said.
Brown did not respond to an e-mail and phone message seeking comment. The transaction was first reported by the Daily Caller.
Since November, the RNC has paid Brown's company, Dynamic Marketing Inc., about $19,000 for printing and direct-mail services, campaign spending reports show. He has contributed several thousand dollars to the party.
The most recent financial disclosure report said the RNC spent more than $17,000 for private planes in February and nearly $13,000 for car services. Heye said such services are used only when needed.
The $1,946 for meals at Voyeur West Hollywood was the most eye-catching item in the monthly report. RNC Chairman Michael Steele, whose spending decisions have angered some donors in this midterm election year, had nothing to do with the nightclub expenditure, Heye said.
The conservative group Concerned Women for America said the RNC should disclose more about the episode.
"Did they really agree to reimburse nearly $2,000 for a bondage-themed night club?" group president Penny Nance asked in a statement. "Why would a staffer believe that this is acceptable, and has this kind of thing been approved in the past?"
Much of the most lavish spending by the major political parties is associated with fundraisers, which often target wealthy people.
The RNC spent $144,549 for rooms at the Four Seasons Resort in Jackson Hole, Wyo., in 2009. On March 19, 2009, it spent $31,980 for catering by the Breakers Palm Beach in Florida.
The RNC paid $18,361 over the past several months to the "Tiny Jewel Box" in Washington for "office supplies," which may have included trinkets or gifts for big donors. It spent $13,622 at Dylan's Candy Bar in New York City.
Some Republican officials and donors have complained about Steele's spending decisions, saying the party should devote every available dollar to trying to win House and Senate races this fall. He held this year's four-day winter meeting at a beachfront hotel in Hawaii, although it often takes place in Washington.
Some donors grumbled when Steele spent more than $18,000 to redecorate his office. Steele, a former Maryland lieutenant governor, also has received substantial fees for making speeches, even though the RNC pays him a full-time salary.
Steele's supporters say he has brought a refreshing frankness and energy to the party's leadership.