The reason they had the party yesterday was because that was their wedding anniversary!
Anyway, the traffic on the way there was nowhere near as bad as I had expected. In fact, there was actually less than we normally find when we go to the farm. The party was great. The tarps weren't really needed to keep the sun off, but things broke up just before the tarps would have been needed for shelter from the rain. But it was not much more than a shower, and the evening turned out fine.