Assuming they can actually find a venue that will allow them in. Let them hold their convention. If it's actually a spite con or an alt-right con, it's doomed anyway. I don't know how they came up with 2 as a GOH. He's certainly well known if no longer well liked by many. Typically, to get a guest of honor that really would boost attendance numbers, it's somebody a convention would have to pay an appearance fee too. Not likely for a first year con.
Assuming they can actually find a venue that will allow them in. Let them hold their convention. If it's actually a spite con or an alt-right con, it's doomed anyway. I don't know how they came up with 2 as a GOH. He's certainly well known if no longer well liked by many. Typically, to get a guest of honor that really would boost attendance numbers, it's somebody a convention would have to pay an appearance fee too. Not likely for a first year con.