"Night at the Museum: Battle of the Smithsonian," Gainesville. Dusk today, Smithgall Arts Center, 331 Spring St., Gainesville. Free.
Model Train and Railroad Artifact Show and Sale, Norcross. 9 a.m. to 4 p.m. Saturday, North Atlanta Trade Center, 1700 Jeurgens Court, Norcross.
Family Fun Day, Gainesville. Sack races, tug of war, pie throwing contest, face painting and yard sale. 9 a.m. to 2 p.m. Saturday, East Hall Community Center, 3911 P. Davidson Road, Gainesville. 678-450-1540.
Family Sunday: Good Old School Days, Gainesville. Attend "school" as they would have in the 1800s in Chief White Path's cabin. Museum scavenger hunt and crafts. 1 to 4 p.m. Sunday, Northeast Georgia History Center, 322 Academy St., Gainesville. $5 per family; free for members. 770-297-5900.
Battle for the Southern Frontier: The Creek War and the War of 1812 history forum, Gainesville. 7 p.m. Tuesday, Northeast Georgia History Center, 322 Academy St. NE, Gainesville. $3; free for members.
"Elmo's Green Thumb," Atlanta. Sesame Street Live. 7 p.m. Sept. 17; 10:30 a.m. and 7 p.m. Sept. 18; 10:30 a.m., 2 and 5:30 p.m. Sept. 19; 1 and 4:30 p.m. Sept. 20, Philips Arena, 1 Philips Drive, Atlanta. $17-$87. Ticketmaster.
"Tools for Living," Sautee. Exhibit of tools used to sustain early valley inhabitants. 10 a.m.-5 p.m. Monday-Saturday, 1-5 p.m. Sunday, Sautee Nacoochee Community Association History Museum, 283 Ga. 255 N, Sautee. 706-878-3300.
Movies Under the Stars, Buford. Concert and movie. 6:30 p.m. Saturdays through Sept. 5. Mall of Georgia, 3333 Buford Drive, Buford. Free. 678-482-8788.
Story times, Hall County. Children can listen to stories, sometimes read by special guests. Various days and times at libraries in the Hall County Library System. Free.
"Waters of Time: The Chicopee Woods Story," Gainesville. Learn about previous eras and inhabitants of Chicopee Woods. 10 a.m. to 5 p.m. Monday-Saturdays, Elachee Nature Science Center, 2125 Elachee Drive, Gainesville. $3 adults, $2 children ages 2-12, age 1 and younger and members free. 770-535-1976.
"Dinosaurs: Ancient Fossils, New Discoveries," Atlanta. Through Aug. 16, Fernbank Museum of Natural History, 767 Clifton Road NE, Atlanta. $15 adults, $14 students and seniors age 62 and older with ID, $13 children ages 3-12, free for children age 2 and younger and museum members. 404-929-6400.