Great shots -- looks like a great time!
As an aside, can I just say how happy I am to see someone else who actually puts their kids in a car seat even if they may appear big enough to not need one? I know the laws are really restrictive but I've lost track of how many times I've seen parents disregard child car seats entirely. Enfuriating.
Getting back on track, thanks for sharing. I've never made a sanctioned event like that and may have to start planning.