You do seem frequently bewildered that people have different levels of interest about things, and therefore knowledge about them, than you.
The middle Sunday of Wimbledon was always a day off, they only ever played that day if it had tipped down all the first week and they'd got massively behind.
From what HCZ says that only changed a few years ago, it's rare these days I watch that much Wimbledon, so no I didn't know that.
Why is that such astonishing news for you?
I have actually watched more of Wimbledon this year than I have for years, but it's rare I watch much more than the final.