One time they were dared to go to a high school in America as transfer students. They all joined band (England with a trombone, Norway with percussion, and Romania as a tuba) and had a fun time sacrificing cursed instruments, being gay/bi/demi, and having a good time.
Then came Hogwarts. They were starting over at that school for who knows what time. They rallied all muggleborn and half-bloods to storm in playing like they were in a marching band and got the purebloods so confused. They actually made it a tradition that's still around today.