As these two events have coincided for the last three(?) years, maybe its time for one or other to consider shifting forward or backward a weekend? Just a thought..?
To be honest, Oundle is a lovely place and its always got something or other going on, on top of the food fayre this year there was two or three large weddings which took up hotel places, but again the car parks weren't full and you could get around and there was longer queues in the coffee shops but nothing near the wait in say the Leas at Folkestone.
The event takes what dates it can sometimes as the halls are booked years in advance.
Robin