I've been several times. Lots of fun. Usually no problem finding parking, and you can pay admission right at the door. It was $15 per person, per day, last year. Often it pays to do a quick walk through when you get there, sometimes people have freebies, I got a free knife designed and engraved by Blackie Collins one year. Some vendors, like Rick Hinderer, run lotteries. Due to limited supply, winning a lottery just affords you the ability to BUY the knife. (Hinderer knives used to be heavily marked up above what he charged for them directly, not sure if that's still the case. Many makers have more demand than supply and have multi-year waiting lists, winning a lottery gets you the chance to bypass the wait, but I often wonder how many people win them and then flip them for a profit as soon as the blade show is over.) After a quick walkthrough, that takes about an hour, I go to the booths that interest me.
I don't know your interest but Spyderco usually has lots of new upcoming and prototype models available. It's awesome to get to meet and discuss the knives with the people that build them. Spyderco usually has a no photo policy on prototypes.
Pretty much any knife you would like to buy will be there, but not always at the same price as available online, for production blades anyways. To me the great thing is getting to handle the knives, although I am yet to come home empty handed.
Several other booths will be set up by companies that aren't exactly knife companies. Tactical flashlights, backpacks, keychain tools, etc.
There are workshops available and competitions, but I've never managed to get to any of those, maybe next time.
Grizz