Hell, I loved your logo (loved all of the submissions, too) and my non-legal opinion is that there should not be a problem using it in a non-commercial way for the attendees of Jonifest. Now if t-shirts, posters, handbills with your logo started being sold on eBay or other websites, that would be another question but I assume that is no one's future intention.
Kakki > If there are continued objections over the use of my logo, then I ask Ashara > to withdraw it immediately and go with whichever design got the second-most > votes.