You think ya'll don't have community spaces? I have 100% seen things like this flying into numerous European countries and in the larger train stations, they just didn't have the obnoxiously ostentatious signs (which I sorta appreciate having, though it's form is laughable it's a decent warning about what's going on there so you can avoid it like the plague). It's pretty common to have some sort of designated managed space within public spaces, with an admitted abstraction it's not all that different from getting parade permits or reserving space in a park.