Recently I had the awesome opportunity to participate in the Uth Daze Festival as part of bcurrent's rock.paper.sistahz festival and National Youth Arts Week. I ran a mask making station on a beautiful spring afternoon. Kids and parents rolled through the park at Wychwood Barns and before they knew it they were making awesome paper masks.
The event was great, I highly recommend going next year. My mask making was only one of the things offered. There was origami and live performances as well as face painting (which is mask making of a different sort).
Basically the kids made a simple paper mask out of cardstock and added things like ears, noses and designs to make wearable art pieces. Here's a picture of a happy young mask maker with the finished product!