Are you sure you don't mean 'mummers', rather than 'murmers'? Mummers are troups of amateur actors who perform plays at Christmas. They will visit house to house, usually to friends and neighbors. The trick for the host is to guess the identity of the mummers, since they often wear masks and disguise their voices. It's a bit like house-to-house caroling (singing Christmas songs), only with acting and costumes. There are other definitions of mummers, which you can search for on the internet. Anybody from Newfoundland, feel free to correct me!