Upcoming

■ G4G13. Hosted by the Gathering 4 Gardner Foundation, this 13th biennial event—dedicated to preserving the legacy of writer and polymath Martin Gardner for popularizing recreational mathematics—will include free events open to the public, in downtown Decatur and around Atlanta, from April 11-15. Spelman College Mathematics Professor Colm Mulcahy, vice president of Gathering 4 Gardner, said the lecturers will be “three of the world’s leaders in the interface of mathematics with puzzles, art and music.” Gathering4Gardner.org.

■Rubik’s Cube inventor. 7 p.m. April 11. Free. Georgia Tech’s Clough Auditorium, 266 Fourth St. NW, Atlanta. Professor ErnÅ‘ Rubik, famed Rubik’s Cube inventor, will make a very rare public speaking appearance with “In Conversation With ErnÅ‘ Rubik,” discussing design, architecture, curiosity and his four decades with the Cube.

■Decatur Street Fair. 4-6 p.m. April 13. Downtown Decatur’s Depot District on E. Howard Ave. from Sycamore Place to Hillyer Place. Decatur Street Fair will include Math Walk, Sculpture Construction, Puzzle Solving, Magic Performances and “M.C. Escher +” Art Exhibit Sneak Peek.

■“Math and M.C. Escher’s Art.” 8 p.m. April 13. Free. Decatur Presbyterian Church, 205 Sycamore St., Decatur. Professor Doris Schattschneider of Moravian College will lecture.

■Artist’s Reception. 5-9 p.m. April 14. Different Trains Gallery, 432 E. Howard Ave, No. 24, Decatur. Artist’s Reception for the “M.C. Escher +” Art Exhibition that will be open through June

9. DifferentTrainsGallery.com.

■“Poetry, Drumming and Mathematics.” 2:30 p.m. April

15. Free. Fulton County Central Library, One Margaret Mitchell Square, Atlanta. Winner of the Fields Medal, the highest honor a mathematician can receive along with the Abel Prize, Professor Manjul Bhargava of Princeton University will present this lecture.