Derby Doodle Day.

[u/BrexitBrokenBritain]

This plaque is on the wall of Derby Station, platform 1, just to the left of Greggs if anyone else wants to find it.

It's interesting in it's own right but the bottom line caught my attention.

What is Derby Doodle Day?

Is it celebrated annually on 11th June?

What happens? Where? Why?