After hours Chillout
Let everyone know how it went!
Make sure to follow up after the party is over. Write a blog post summing up, share pictures from as well as links to everyone's link to their Challenge as well as contact details like email, twitter etc to keep the spirit of "Challenge Creators Party Animals" alive. Making a good Challenge requires a lot of testing and iteration so you can prompt your participants to test each others work and/or post their comments here.
In the meatime tell us how it went here and if you would like your Challenges to be featured in our Learn Page, be so inclined as to send an email at help@p2pu.org