Irrespective of whether you are participating in a 24camp or not, you can always help.
- Write a blog post about the camp
- Spread the word to your friends through IM/Twitter/Facebook/Google Buzz.
- Be online and help out the other participants in case they need something.
- During the camp, tweet regularly about what your are working and how it is turning out. Use the hashtag #24camp.
- Take pictures and upload them to public. Link to the pics on the wiki page for the camp.
- After the camp is over stay around and help the coordinators clean up and secure the place.
And most important of all:
- Continue working on your project and make sure you let the community know the status of your project.