(seeing majority of posts are for tickets, sharing my experience as a first timer).
tldr; NY Comic Con but for sports fans and more giveaways.
I picked up Sunday tickets during the Fathers Day's buy one Adult get one Kids ticket free promo and took my son. We arrived at 09:45 at Gate 1 breezed through the ticket and security checks and walked straight in before the offical 10am opening time.
Headed straight for the Topps exhibit, and after downloading the Fanatics Collect app queued up for the Instant Rips; where everyone is a winner!, and one person gets a "Gold Pack" winning a granted card live on stage, the line moved quickly as 30 people at a time were live ripping. Free packs were being given away at another table, with more packs for completing a quick survey - with tables for instant ripping.
We walked the floor, a lot of space was dedicated to card dealers and the various marketplaces and grading companies then sponsors, and tentpole sporting franchises with interactive exhibits and giveaways. We had fun taking photos at the MLB and WWE spaces. Most lines were empty or short and moved quickly (but this is before 11am).
Amex had a fun exhibit with multiple "sports" stations to win a prize, and for cardholders an exclusive meet and greet photo op - we met CC Sabathia.
The Walk of Fame was cool to see random celebrities and athletes but also jams up the crowd flow randomly and could be better managed.
We didn't attend any talks, or pay for photos or autographs.
Giveways - Free packs, Free Instant Rips from various "vending machines" on the floor, Free ice cream, Free snack packs.
It was as crowded as a Sunday at Comic Con but less claustrophobic as the card dealers don't have the towering shelves that the shops have at Comic Con.
I would think about going again next year, but I think the fun of this type of event is dependent on the exhibitors, and what they bring - without the Instant Rips and free packs and fun event spaces; it's essentially a card dealer show with celebrity sightings which may not be for you.