Con folk from the cons*
I've never been to San Diego Comic Con. However, I've been to enough cons that I can tell you that there is a tremendous amount of truth in the following jests:
From College Humor - "The 7 Parents You'll See at Comic Con"
(For the record, my dad was #2, minus the costuming.)
From Dorkly - "Fifteen People You'll See at Every Nerd Convention"
Also from Dorkly - "17 More Peopl You See at Every Nerd Convention"
From Cracked - "Who Actually Goes to Comic-Con [CHART]"
* It's short for "convention," if you were wondering, not a reference to being a "convict" or a "confidence man."