There is also a QRP-only winter Field Day; "Freeze
Your Butt Off", sponsored by the Arizone ScQRPions:http://www.azscqrpions.org/ScQRPion_OPERATING_EVENTS.htm
A word of warning; QRP contests are mostly CW, so if
you don't have some active morse operators in your
group, the pickings will be slim.
But QRP outdoor events are easy and cheap to deploy;
you can use gel cell SLA or 'AA' batteries, so it's
not necessary to arrange for a gasoline powered