For the most part it is probably a massive fan meet and great.
I attended the Adult Video Network awards this past January because I ended up staying at the host hotel for Shot Show.
First couple of days were extremely slow, event was fairly boring but I got to actually meet, talk to, and spend some time with a few of the girls. If you do this DON'T talk about their work, talk about them as people. Learn where they grew up and things that they personally like.
Last couple of days it was a madhouse of fans, and yet when I went by the booths of the girls I had spent time talking to, they would drop what they were doing to give me hugs or do something special because they already "knew" me and knew that I would keep it at the level they were using to work the crowd.
Do not expect to do more than see shows, if you have sex you probably brought your partner. Hooking up with these girls is a matter of pure luck more than anything.
On the other hand, some of them will do private photo/video shoots for the right price, and you can always ask about gonzo porn prices.