Jeff,

My experience has been that breakages in this kind of event are somewhat rare. We usually take a little extra time during setup before a week long event like this to make sure every ring and pin are taped in place and that all lines are fresh with no chafing. We have the same spares that we usually have on hand for a weekend event; hot stick, spin pole (if possible), spare rudder blade, spare daggerboard. Backup sails (particularly a spinnaker) are nice if you have them too. With the number of people participating, somebody has a spare for whatever you need.