You may come and camp alone, with friends, you can join a camp or organize one.
To join an existing theme camp, check the forums.
In camps people share their resources to make life easier or find a theme that is interesting to them
and create the activities or the design around this topic.
Feel free to be totally creative about this.
You can start a theme camp alone and try to find people who want to join you on the forums or find some friends from home and start a camp.
Let us know about it, contact firstname.lastname@example.org
(or do it secretly and surprise us at the event )