“Hats, Hats, and More Hats!” children's book festival presented by Friends of the Claremont Library. Children and their families are invited to the library for an afternoon of stories, activities, crafts, magic and more—all with the theme of hats. Every child will receive a book or 2 to take home, while supplies last. Free and open to the public. 1 to 4 p.m. Claremont Public Library, 208 N. Harvard Ave., Claremont.
Sustainable Claremont Garden Club presents a workshop on the positive and negative effects of transforming traditional non-native gardens to native gardens, led by Wallace Meyer, director of the Bernard Field Station.
Tim Thompson will present on the Hubble Deep Fields at the monthly meeting of the Pomona Valley Amateur Astronomers. Visitors are welcome. 7:30 p.m. Harvey Mudd’s Beckman Hall, 1250 Dartmouth Ave. Email firstname.lastname@example.org for further details.