Some info here:-
Aughakillymaude Community Mummers Centre

and on YouTube:- Men of Straw - an intro to the Fermanagh Mummers

"All Silver and No Brass - an Irish Christmas Mumming" by American folklorist and social historian Henry H Glassie is a wonderful book, with illustrations by Glassie himself, describing the traditional hero-play found in this part of Ireland, and the people for whom it was a living tradition.

All silver and no brass: an Irish Christmas mumming
By Henry H. Glassie
Edition: reprint, illustrated
Published by University of Pennsylvania Press, 1983
ISBN 0812211391, 9780812211399
192 pages

Available from Amazon.co.uk for £14 post-free (recommended - click through from Mudcat) or you can view it at Google Books.

Ross