I was given a tee-shirt with a picture of a Jet 6. It was made by these people
http://www.bc-collection.euLooking at their web site, I think their logo upload tool was used to create it, but as it was a gift I don't know the process for obtaining them. Probably not terribly helpful in view of the timescales, but may be useful in the future. Good luck in the event anyway, and let us all know how you got on.