That turned out to be a non-event! I haven't been at my computer for the whole day, but I can't say that I noticed any new locations appearing on the network.
Perhaps some boxes have been on for longer than normal (Canary Islands, and JFK ground returns, for example), but perhaps we had overall more returns than we would have done otherwise.
The Network Statistics page shows a slightly higher maximum number of boxes than I reported in the previous Max Effort thread (392 compared to 373, but my post in the Poll thread had the number at 421), but the max number of flights will remain a mystery for ever as, despite pleading emails to AirNav, the flights graph broke and was never repaired :-(
Netcop Nick's idea of AirNav having a "free network" day seems a much better one, because people who don't share are probably largely in the group who don't subscribe to the network, and a free network day would give them some feedback, which today's exercise didn't.
Ah well, it was worth a try. To those who did make an effort yesterday, many thanks, and happy Christmas to all RadarBox users and forum members.
Rod