Ted Brazier is trying to put together a "super corps" for the upcoming Santa Claus Parade in Toronto, ON. It's not clear wether old-timers can participate unless they are already associated with a 'corps. See this post on the ODCA site for more info.
What I remember about the parade from my Ambassadors days is "no hymns or religious music is to be played". The proximity to the Christian holiday is purely coincidental. :-P