I've been going through the university libraries and struggling to find anything. This isn't for a project, just a bit of curiosity because the topic has not been addressed on any of the American history survey courses I've taken. Any pointers for where to start looking for primary sources would be really appreciated.
3rd year undergraduate History major.
So this is a pretty limited field, and one I'm not tremendously knowledgeable about (my interests lean more towards post-WWII LGBTQ history.) If you haven't read George Chauncey's Gay New York definitely pick up a copy. Although it doesn't exclusively focus on black communities, it does have a chapter dealing with black gay life in Harlem in the 1910's, 20's, and 30's. More broadly, Gay New York is required reading for anybody studying early 20th century American LGBTQ history.
I haven't read Gay Voices of the Harlem Renaissance by A.B. Christa Schwarz but that seems like it might be useful to your studies. At the very least it might help point you in some possible directions for primary sources. You might also want to check out this biography of Richard Bruce Nugent. The Harlem Renaissance might be a good place to begin your research. Quite a few prominent folks from that time fell somewhere on the "something other than straight" spectrum - Ma Rainey, Angelina Weld Grimke, Gladys Bentley, Alice Dunbar-Nelson, and Countee Cullen.
I wish I had more to give you. I might be able to point you in a clearer direction if there was a specific thing you wanted to know more about, but unfortunately I just don't know a ton about this time period.
If you're OK with works of fiction as "primary sources," I'd highly recommend James Baldwin's novels Another Country and Giovanni's Room.
Howdy, in addition to /u/Cephalopodie suggestions, I would recommend One of the Children: Gay Black Men in Harlem and Sweet Tea: Black Gay Men in the South The latter I recently finished and would highly recommend, though it does take a little bit of understanding Southern Black Culture as well as Church Culture in the African American community.