First henna convention

I'm going to the Big Raindrop conference in Kent, WA next month. I've got a handle on the "how-to" attend a face painting conference, but what about a henna conference?
I know what to take for a stripped down FP kit, but the henna bit is throwing me a bit.
Do I bring my own cones? How do I time the dye release to last through the convention? Do you bring your own henna in a cooler? Is it provided there? What other henna supplies do I need to bring with me? I'll be driving up, so I don't have to worry about carry-on TSA worries.
Thanks!

There will be fresh henna available for purchase daily and any of the interactive hands on henna classes such as the 101 class will provide henna in cones for the classes. If you prefer jack bottles or other henna applicators bring your own and you can fill them with the cones for classes. I am sure jack bottles and other applicators will also be available for purchase from vendors.

At past conventions I have been to some people have brought their own favorite mix with them in a cooler. I believe all the rooms come with a mini fridge you can store your paste in if you want to bring your own.

Thanks Amy! Looking forward to meeting you. =)