Heavy Nettle: Wild Spring Edibles is from 10 a.m. to 2 p.m. at Felix Neck Wildlife Sanctuary. Learn how to prepare and cook nettles and other spring greens with local chefs. Lecture by herbalist Holly Bellebuono. Bring a dish to share and your own place settings. Cost is $5, or $3 for members of Mass Audubon or Slow Food Martha's Vineyard. Visit slowfoodmarthasvineyard.org.