Well, I won't be going now after just seeing the date clash...!!
TFC have massively cocked up here, by moving it to a airfield location that close to Northampton and then choosing a date that clashes with the British GP at Silverstone, with Northampton being a major Park n Ride location for Silverstone. The traffic impact in that area from the GP will make accessing Sywell a disaster.
My route to get to Sywell would involve going up the A43 right past Silverstone, so, that's me out.
Oh well.