Cubs Convention advice needed

Hey everyone,

I'm taking my 8-year-old son to the Cubs Convention next weekend. We've never been before, so I'm pretty excited! But also in need of advice.

I'm mostly wondering how autographs work. Do fans bring things for autographs? Like baseballs, player cards, or pictures, for example? Should I buy a book that can be filled with autographs? Or will the Cubs provide things for autographs? I want the autographs that my son gets to last his whole life, so I don't think a few pieces of paper handouts would be a good idea. Should I bring a folder?

Also, any general notes on what to expect are appreciated! I get the Cubs emails, so I know what's on the docket. But it would be nice to hear from a fan's point of view how the event actually is. Is it packed shoulder-to-shoulder? How is the food? Will there be a place to charge my phone?

Thanks in advance!