Preschool

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