The Magic Tree House Book Club meets the third Thursday of each month to explore a different book in the series by Mary Pope Osborne. The event, from 4 to 5 p.m. at the Oro Valley Library, 1305 W. Naranja Drive, includes activities, crafts and discussion. Come even if you haven’t read the book. This month: “Earthquake in the Early Morning.” Registration required. Free. 594-5580.
Walk in a sandy arroyo and learn how plants, animals and indigenous people used arroyos to their advantage at an event at Saguaro National Park West, 2700 N. Kinney Road. Wear closed-toed shoes and bring water. 9:45-11:15 a.m. Included in park entrance fee. 733-5158.
The Oro Valley Church of the Nazarene, 500 W. Calle Concordia, is hosting a community Easter egg hunt at 9 a.m. It’ll include games, crafts and photos with the Easter Bunny. Free. 297-8297.
Celebrate Earth Day at the Oro Valley Public Library, 1305 W. Naranja Drive. Play Earth Day bingo, read Earth Day books and make a craft. Registration is required; space is limited. 4-5 p.m. Free. 594-5580.
Learn how to self-publish your own book at the Geasa-Marana Branch Library, 13370 N. Lon Adams Road. 10-11 a.m. Free. 594-5255.