I doesn't look like I'll be able to make it this year, but having been several times in the past, the registration fee covers the ice time and whatever rental costs are required for the manufacturers display/demo area as well as custom jerseys, socks and a puck. There are also usually give-aways from the manufacturers such as hats, bags, skate towels ect. and there have been draws for larger prizes at some past events. Picking the reps brains, seeing the new gear and getting to try some of it out is all great. The game itself is a very relaxed fun pickup game with a wide variety of skill levels as IPV6 mentioned.
The dinners are a separate cost. I don't know what's being done this year, but for past events there was a BBQ/party on Friday at the host hotel with a reasonable fee to cover the costs of the food and then a dinner at a restaurant on the Saturday (usually followed by hanging out at the host hotel). These events are optional, but recommended as you get to meet fellow members with a shared common passion for the sport and equipment and hang out. It's flexible, if you can't make it to the dinner on Sat, but want to meet at the hotel after then that usually works. I've always enjoyed the BBQ and hotel hangouts with the other members; there are a lot of laughs and interesting discussions.