You might expect, if there’s a Game Of Thrones panel for example, that many, many more people than usual would choose to cosplay as a Game Of Thrones character on that day.
For example: why did I see a woman driving around a dog in a remote controlled car?
Here’s the interesting thing about costumes during Comic-Con.
There may be a few more than usual, but on the whole, people just roll with whatever they want, whether it has any connection to Comic-Con or not.