Some question as first time Fan Expo Chicago attendee?

For instance, we have tickets for Saturday. Just for fun, stuff for kids, maybe meet a celeb if we have time but I’d rather just walk around and catch a glimpse of a few. Would we be able to see most of them at their booths? If I wanted to meet Corey Feldman, are lines usually long for him? Maybe get a selfie if his table allows it. I’ve been to a few conventions but they have been in hotels. This is at a convention center.

There are clips of fans meeting celebs on TikTok that seem like there isn’t much of a crowd but I’m assuming that is VIP? If we get there before it starts and get into the show at 10 am will be already be packed? Will mostly check out the kids themed things since I have my 6 year old nephew with me but would like to at least see celebs even if from a far. Since I’m a child of the 80’s and early 90’s my nephew knows some of them (but when they were young so it could be confusing) but I’m sure he will like the Cosplay especially if any Marvel people? How many different rooms are there?