Morriss dancing isnt a real thing. It is just something silly invented by the BBC as a self-deprecating joke, like Canadians street vendors selling fried beaver tails.
It's a load of different morriss dancing troops dancing around the town with a parade with the lot of them. And there are a lot. Bloody freezing some years though!
Also, in the same vein, this weekend I think there's the annual Sea Shanty festival in my home town.
The videos are quite bad at conveying how great some of the groups are, especially sitting in a smallish pub with a pint listening to some amazing singers do sea shanties. Quite magical.
You and your friends get a stick each, together you drop it off a bridge over a stream (upstream side), then you run to the other side of the bridge, whichever stick appears first is the winner.
It is a part of our culture, like pubs, pooh sticks, morriss dancing or cheese rolling.
It would be a totally valid citizenship question.
Maybe you're a city child?