Nelson Mandela International Day takes place on Saturday, 18 July 2026, though the entire month of July is observed as Mandela Month in South Africa. The official 2026 theme is “It’s still in our hands to combat poverty and inequity,” which calls on citizens to dedicate 67 minutes of community service to honor Madiba’s legacy.
https://www.gov.za/NelsonMandelaMonth2026
https://www.timeanddate.com/holidays/un/nelson-mandela-day