Lynne Cherry, author of "The Great Kapok Tree" and "The Armadillo from Amarillo," will spend the day at the Wildflower Center, signing books from 9 to 10:15 a.m. and again from 3:00 to 4:30 p.m. She will lead a hike at 10:30 a.m., then from 12:30 to 2:30 p.m. she will present a slide show and lead a workshop on how to use nature to help children learn.