I did something similar on Saturday. After postponing a trip to Belgium, I thought where would I like to go instead. Ah, I know, Bristol Filton - I can can continue my quest to visit as many Concordes as possible, and land there before the place closes down at the end of the year. I spent a good deal of time getting excited by this and planning it.
We spent Saturday morning in the plane trying to get through to Ops at Filton. No answer. Tried again, still no answer. I found an email address so emailed them and said we will contact on Radio when nearby. Just before lining up, we called them once more on the phone. Still no joy. I had a look at the plate once more and there in fairly clear terms was the line "Op hrs: PPR
Mon - Fri 0630 -1900"
Now, I had read all the other important details like circuit height etc, but my tunnel vision and assumption that no large airport like Filton would be closed on a Saturday, led me to miss this vital piece of information. We decided to route to Gloucester in the end, which I have to say is a very nice Airport indeed