See my thread here:http://www.eham.net/ehamforum/smf/index.php/topic,87890.0.html
I would suggest that you and your friends each reserve a 1x1 call for the event. Your club call can only be used by one station at once. Applying for the special event call is a good filter for those who are willing to contribute. Maybe think of some pigeon-related calls; I'm trying to but nothing happens. :-)
The pigeon race sounds like a cool idea. is there one endpoint or multiple?