Thursday, June 20, 10:30-11:15 a.m. – “Rock out” with Bill Waggener, president of the Georgia Mineral Society. Hands-on examination of rock specimens. Free and open to the public. Session 1, at 10:30 a.m., for ages 5-7; session 2, from 12:30-1:15 p.m., for ages 8-12. Registration required by calling 404-814-3500, starting June 1. Email: comments@co.fulton.ga.us for further details. Buckhead Branch Library, 269 Buckhead Ave., NE, Atlanta, 30305.

10:30-11:30 a.m. – Librarian Shannon Duffy helps kids identify minerals, fossils and rocks from the Tellus Museum’s Rockin’ Rollers Outreach Program. Free. For preschool and elementary youth. Additional class, 11:30 a.m.-12:30 p.m. 395 Mount Vernon Highway, Sandy Springs, 30328. For questions or to register, email: leah.germon@fultoncountyga.gov or call 404-303-6130.