Where to see traditional mask carving or devil dancing performances?

Ambalangoda on the south coast is the center for traditional mask carving. There are workshops and small museums where you can see carvers at work. For devil dancing (exorcism rituals), these are still performed in some villages, especially in the south, but they're not tourist shows - they're serious cultural/religious events. You might see toned-down cultural performances at festivals or organized events, but genuine rituals are not usually open to casual observers. Respect the context.