It's amazing that one tiny acorn can grow into an enomous oak tree. Little ones, ages 3 to 6, will investigate the life of an oak tree and its importance in the forest then go on a hike to search for oak trees and acorns.
10 a.m. to 11:30 a.m. Free, but reservations are required.
At Powder Valley Conservation Nature Center in Kirkwood, near the intersection of I-44 and I-270. Call 314-301-1500 for reservations.
Bring your family, a blanket, and some snacks to the Ballwin Golf Course for a free showing of Star Wars: Episode V: The Empire Strikes Back.
Watch Luke Skywalker as he trains with Yoda all while avoiding being captured by Darth Vader. The movie is free.
At Ballwin Golf Course. 8:30 p.m.
More information: ballwin.mo.us
Discover the critters and creepy-crawlers that inhabit Laumeier Sculpture Park at night!
Dig into the current research in seismology, geology and paleontology, see a 66 million year old dinosaur footprint, learn about Missouri's Supervolcano and lots more during Rock, Fossil, Quake: A Celebration of Earth Science, a free event at the Saint Louis Science Center.
Learn about monarch caterpillars as they prepare to transform into beautiful butterflies during this parent-child workshop.
Catch 'em all and try to be the best there ever was during Pokemon Go Night at the Saint Louis Science Center. There will be amazing science demonstrations, Pokemon-themed food and drink specials and more.
The Science Center will be open late 'til 8 with lure modules set at their Pokestops all night. Show your team pride by battling for control of the gym located at the James S. McDonnell Planetarium. The Planetarium will be lighted in the team color of whoever controls it at the end of the night! Don't miss the demos from local augmented reality and virtual reality developers.
Kids can learn all about their favorite prehistoric creatures at Digging for Dinosaurs, a free workshop for preschoolers age 3-5.
Presented by Mad Science of St. Louis, in this workshop, get an up-close look at a dinosaur tooth and participate in a mini dinosaur dig. Registration is required.
Digging for Dinosaurs will be held:
Sept. 6 at 10 a.m. at the St. Louis County Library, Grand Glaize Branch.
More information and registration: slcl.org
The Saint Louis Art Fair is a free, three-day celebration of the visual and performing arts that includes a Creative Castle for kids on Saturday and Sunday.
The annual Kirkwood Greentree Festival will be held September 18 - 20 in Kirkwood Park. This free, family festival features a parade that steps off on Saturday at 10 a.m. beginning at Kirkwood High School, entertainment and food vendor booths, and kids activities.
Wagon rides, live entertainment, great festival foods, a petting zoo and much more make this an apple pickin' good time for the whole family. There will be pony rides, a children's carnival, opportunities to feed goats and other farm animals, caramel apples, funnel cakes and more.
Enjoy a family-friendly celebration of autumn at the Saint Louis Zoo's Zootoberfest! Kids can participate in all the regular Zoo fun and explore new adventures at Zootoberfest activity stations. Families will enjoy an Oktoberfest-style event with beer and root beer, German-themed cuisine, and live music.
Families are invited to the Saint Louis Art Museum on Sunday afternoon to participate in free hands-on art activities with fun themes and to explore the galleries. Each Family Sunday focuses on a different family-friendly theme.