A Florida venue canceled an event on Saturday featuring Marjorie Taylor Greene, the far-right Georgia congresswoman and acolyte of Donald J. Trump, after materials promoting the event advertised it, in part, as an occasion marking the third anniversary of the Jan. 6, 2021, attack on the Capitol.

The gathering was being organized by the Osceola County Republican Party in central Florida as a book-signing event for Ms. Greene. It was supposed to take place on Saturday at the Westgate Resorts in Kissimmee, Fla. But backlash ensued after State Representative Anna V. Eskamani, a Democrat, posted on social media a screenshot of a text that advertised the event as being on the “3rd Anniversary of Jan 6.”

Ms. Greene has repeatedly downplayed, and at times defended, the deadly insurrection at the Capitol three years ago. She has elevated popular right-wing claims, which have been refuted, that the attack was orchestrated by F.B.I. agents. In November, she called on House Speaker Mike Johnson to create a new Jan. 6 select committee to investigate the original committee’s members.

Ms. Greene addressed the change in venue on Friday night, writing on the social media platform X that she won’t be backing down to Democrats who she claimed “tried to shut down my book-signing, but the show must go on!!”

Mark Cross, the chairman of the Osceola County Republican Party, said he had first received notice that the venue had pulled out on Thursday evening. He attributed the cancellation to a “combination of disinformation that was put out and a lot of miscommunication between parties.”

The theme of the event was meant to honor Republican women, Mr. Cross said, and the event “just happened to be on Jan. 6.” He added, “We’re not going out of the way to celebrate Jan. 6 — it’s something that happened. It was a negative thing for everyone involved.” He noted that the group “didn’t pick the day.”

A representative for the resort confirmed that the event was no longer taking place there but declined to elaborate.

“Please be advised that Westgate was not made aware of the purpose of this event when we were approached to host a book-signing,” Westgate Resorts said in a statement to NBC News, which first reported on the event.

The party’s book-signing for Ms. Greene will now take place on Saturday at a Veterans of Foreign Wars post in St. Cloud, Fla., Mr. Cross said.

The event was originally advertised as an opportunity for attendees to hear from Ms. Greene and receive signed copies of her book, “M.T.G.” Prices to attend started at $45 for general admission and went up to $1,000 for “super V.I.P.s,” who would be allowed to attend a “special private briefing on J6 and DC.”

Ms. Eskamani said in an interview that she was sent screenshots of the text by two friends. She praised Floridians who had “created the backlash” that preceded the cancellation of the event at the resort.

“When I saw that text message, my first reaction was, ‘Is this a joke?’” she said. “No one should be commemorating, in a celebratory fashion or even with a book-signing, Jan. 6.”

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