For the upcoming diamond league meet I realized I have no idea where the heck this place is. I looked at google and it has it listed a region that encompasses three countries. But given it mostly occupies Poland I'll guess the meet is hosted in Poland...
My friend who visited that Czechia a decade ago told me they are nuts for track out there. He was watching one of the meets (I am guessing diamond league) at some local restaurant. I'd imagine the entire region -- including Silesia region must be big fans of the sport. Perhaps a hold over from the old Soviet times when Athletics was the primary sport and had a lot of fans. Eastern Europe as a track hot spot (fan-wise) is fascinating.