New York’s regulations surrounding the virus allow the club to hold an event in a restaurant or similar facility in many areas of the city, provided the gathering does not exceed 25 percent of the venue’s capacity or 50 people, whichever is fewer. In-home gatherings are limited to 10 people.

Mr. Wax declined to disclose the location of Thursday evening’s event, citing concerns “about the safety of our guests from violent left-wing attacks.”

Mr. Wax also refused to say how many would actually attend, but at least 65 people had indicated on the group’s Facebook page that they were planning to be at the event, as The Daily Beast reported. That would exceed New York’s 50-person maximum.