I have confidence there wont be problems at the convention because after TMG I told Chris that a repeat would cause a preemptive bann from all conventions. There's a difference between trolls going "don't let Chris come, he said homophobic shit in 2006!" and "don't let Chris come, he's been accused of sexual misconduct at more than one convention". Since then, Chris has gone to at least one other convention and didn't encounter similar issues IIRC.
My fear is the plane trip but I'm going to contact the airliner and notify them that Chris is a first time flier who will need assistance. I'll also give some frequent flier tips for a good trip and check on the luggage situation.