Yep, having been to Dragon*Con this weekend with some Deaf friends, I was kind of appalled to discover that only one of the panels they had wanted to attend had a terp. Dragon*Con does provide Line of Sight seating for Deaf/HoH participants, so lip readers can sit up close and either see the panelists or the interpreter, but...bwah? They went to multiple very large panels with ballroom-sized seating. I would assume a con with 50,000 people would have interpreters for all their large panels, even if they couldn't manage it for every single panel. (Although, looking at their "Disability Services" section, it looks like their interpeters are volunteers. Not On.)