I really hope that you will still come to Sywell as it's where my shared aeroplane is based and I'm looking forward to meeting you there on the day. The flying businesses and those private owners I've spoken to at the airfield are united and vocal in their concern about the recent unscheduled closures. On a practical level there seems to be an acceptance from the management of the airfield that there was not adequate notification of the closures, so I do not believe that people will find themselves unexpectedly being turned away in the air except for proper air safety reasons, e.g. damaged aircraft blocking runway(s) etc.
My feeling is that it would not be a good thing in the long run if people wishing to preserve and promote flying in general were seen to "voluntarily" withdraw from flying there - that seems to me like exactly the route to finding a shiny new out-of-town shopping centre or housing estate on those grass runways. Especially given the number of unusual and interesting aeroplanes which congregate and operate at Sywell. The busier the airfield and the more demand for flying activities, the better.
Look forward to seeing as many people as possible on the day - I will be around from 9 am, probably lurking around somewhere in the vicinity of a Yak-52.