The internet is a fantastic place for all sorts of resources. So I have gathered together a few for you to be able to just print off a dragon mask. I hope that you find something that you can do here:
https://mrprintables.com/dragon-masks.html
https://www.printablemasks.net/preview/Dragon_Silly_Outline_Mask
Or you can be adventurous and draw your own mask. I think most of us will have a box of cereals in the kitchen, so you can either cut out a mask from the internet or draw your own creation. Then string it or use some elastic bands to be able to wear it. Have fun with it.
The Story Shed 