I just returned from a brief trip to Berkeley to celebrate the opening of a museum exhibition on Moroccan Jewish art that I helped research: The Invisible Museum: History and Memory of Morocco. It's open all this year until Jun 29, 2018, so if you're in the Bay Area I would highly recommend visiting it! Unfortunately there's no henna in the exhibit, but we do have some magnificent examples of the keswa el-kbira, the multilayered gold-and-velvet dress worn during the henna ceremony, which I've featured on this blog before.
Moroccan henna dresses in the Magnes collection, on display in the exhibit.