As part of the children's cross-curricular studies about the Black Death, I linked my Art by learning about Masks. The class had previously studied the Egyptians, so this linked well with their knowledge from that.
This is a simple presentation which will allow you as a class to discuss what masks are, who wears them and why, and to compare different examples from cultures around the world. I haven't included a specific activity, but from this we went on compare/contrast the examples, and then over future lessons focus specifically on Death Masks before the class designed and made their own. Can easily be adapted for a different topic which features masks!