It is difficult to trace back the roots of mummering/mumming, as there are records of mummers from the Middle Ages in various capacities in France, Germany, and England. More recently, the Christmas tradition seems to have been brought to Newfoundland from West Country England and Ireland, where many Newfoundlanders can trace their roots.
Anyone and everyone was invited to participate in the Mummers Parade, as long as you were in disguise! This is a quick video we took while we were gathered together before the parade started. People had already starting making some noise with their instruments:
"The Mummers Song" - YouTube
Mummering - Wikipedia
Traditions - Mummers Festival