From the Mummering in Newfoundland page:
Sometime during the twelve days of Christmas, usually on the night of the "Old Twelfth", People would disguise themselves with old articles of clothing and visit the homes of their friends and neighbours. They would even cover their faces with a hood, scarf, mask or pillowcase to keep their identity hidden. Men would sometimes dress as women and women as men. They would go from house to house. They usually carried their own musical instruments to play, sing and dance in every house they visited. The host and hostess of these 'mummers parties' would serve a small lunch of Christmas cake with a glass of syrup or blueberry or dogberry wine. All mummers usually drink a Christmas "grog" before they leave each house. (A grog is a drink of an alcoholic beverage such as rum or whiskey.)
When mummers visit everyone in the house starts playing a guessing game. They try to guess the identity of each mummer. As each one is identified they uncover their faces, but if their true identity is not guessed they do not have to unmask.
For a time the old tradition of "Mummering", or "Jannying" as it is sometimes called, seemed to fade, especially in the larger centers of Newfoundland. But in recent years, thanks to the popular musical duo, Simini, who wrote and recorded "The Mummer's Song" in 1982, mummering has been revived. It is just as prevalent and popular as it was years ago and young and old look forward to dressing up this Christmas, knocking on a friend's door and calling out "ANY MUMMERS ALLOWED IN?" [continue]
Lyrics to Any Mummers 'Lowed In song, by Simani.
Simani has a .wav sound clip of Any Mummers 'Lowed In
Mummering in François, south coast of Newfoundland