There used to be a full on BMX demo organised by the seventies crew at the bike show every year. Loads of top US riders would come over. Eventually the seventies guys thought they might as well just do it themselves, away from all the other cycle stuff that is there so they revived the Backyard Jam that is still going now. I think someone else still does a BMX demo and its still quite good. Ive not been for a few years so Im not sure.