As I said earlier, comics are now less than half the convention. A lot of it has shifted in focus to multimedia so you have a lot of video-related material there, mostly fantasy & science-fiction, some anime. Autographs for the big stars or getting into they big name speeches will require standing in line anywhere between 30 minutes to 3 hours.
Vendors will carry tee-shirts, costumes, bathrobes, light switches, signs, etc. Pretty much anything you can think of that's related to fantasy, science-fiction, comics, anime, or anything else that requires prolific use of your imagination. That will probably include people who still believe Hillary Clinton didn't send classified information on her email server and that Obama is the greatest president of all time.
A lot of the comic book creators there will have their artwork on display and/or for sale. They usually have Neal Adams and George Perez (for us old farts that remember when comic books were great) as well more contemporary artists like J. Scott Campbell, Nei Ruffino, etc. Nei is an odd but nice girl ... she is an AMAZING colorist.
However, I suggest saving your money if you don't like crowds, aren't into F/SF, and the sight of a Wonder Woman costume on a guy hairy enough to play Wolverine bothers you.

