I think that if you are clear about what your objectives are and why you are doing it and that you are doing it exactly as it would have been done, then whoever turns up, knows exactly what they are in for.

You need to be clear that it does not express how you feel about the subject.

I have had a blues singer on at my club, who has talked to me at length about some of the songs he does. He does not condone the songs, but he feels he needs to portray exactly as they were performed in that particular era.
He told me how he had some woman come up to him at the end and have a right go at him for singing a song, using the exact words as was then.
It really concerned him.
So I suggested that before he sang such a song, he should inform the audience that he is doing the song exactly as such and such used to sing it and that he didn't endorse or condone the lyrics, and that he hoped the audience would not get offended with him.

I don't know if I gave him good advice or not, but I felt that if he wanted to sing it as was, then he needed to explain that to the audiience before he did it.