Seconding the need for a source. Hypothetically, it could have been. The Unite the Right Rally was 11 to 12 August 2017 [1] and slcon 2017 1 to 3 September [2].
As I pointed out in another comment though. If these guys are diehard Nazis, they sure are keeping it for the conventions as I have seen nothing of it on the mailing lists or IRC for four or so years. What I have seen though are about a handful of Anarchists with varying degrees of involvement, but overall politics is pretty rare and it is mostly about using their software, programming in general, and how to find software that complies with their overall ideology.
