More than two dozen environmental organizations will be at Winterthur for this special day celebrating nature and the environment in the First State. The day will include fun, hands-on workshops, demonstrations, and hikes on topics such as water, wildlife, plant life, and nature. Special guests include Charlie Engleman, host of Weird But True! and Lt. Governor Bethany Hall-Long. Members $10 per adult and $3 per child; nonmembers $20 per adult and $6 per child.