I've answered this one before, but it's worth a repeat.........
Up to the late eighties, we used to hold display's on the last Sunday of the month. At that time, it was noticed that we clashed with Duxford.
So we changed to the first sunday of the month and we've held shows on such days ever since, but soon after we changed, we noted that we still clashed with Duxford.
What should we do now, change back to the last Sunday of the month and see what happens?