The man, Carlton Huffman, 39, said he had sought anonymity in his lawsuit against Mr. Schlapp, a powerful activist, out of fear of potential retaliation by Trump supporters.
At the annual conference this week, conservative celebrities like Mike Lindell and Kari Lake will attend, as will Donald Trump, but many possible 2024 rivals are skipping it.
The aide, who was working for Herschel Walker’s campaign for Senate in Georgia, made the allegations in a lawsuit filed anonymously. A lawyer for Mr. Schlapp denied the accusations.