I talked to John Cochrane about this issue last year. It's come up before
but he doesn't really know what to do about it. We had a less-extreme
version of this at the Region 3 contest last year. About 2/3 of the
field stayed at home. Of the other third 3 made it around (very slowly)
and the rest landed out in a rainstorm, with one broken glider in the bunch.
It makes for poor incentives -- in order to kill the day, you have to go
risk your plane on an almost guaranteed landout since if one person gets
more than 20 miles away they get 1000 points. I'm not sure what 11.2.3.5
is trying accomplish -- is that in case half the field decides to go play
golf instead one day the rest can still have a contest day?

Matt