This video from the BBC shows how young Indonesian's are being taught the mask dance to ensure the ancient art does not die out.
An introduction to a mask maker in Bali.
(Source: YouTube)
This book in the Senior Library includes information on Japanese masks:
This article looks at the art of Khon mask making and how Prateep Rodpai, who is one of the last remaining Khon mask makers, is keeping the art alive.