We can't use the logo without permission, but if we're running an event, can we mention Gen Con & the event time(s)?
It depends on the context - you can't represent something as "The Official Gen Con ____" or whatever, but saying "We'll be at Gen Con" or similar is probably fine, of course.
If you have any doubt at all, better to ask. Just email [email protected] an explanation of what you're hoping to do we'll get Marketing to approve or let you know what might need to be adjusted.
Gen Con LLC