Celebration of the Mind Day is observed on October 21, commemorating the birthday of mathematician Martin Gardner. Organized by the Gathering 4 Gardner Foundation, this day aims to unite people globally to explore and enjoy puzzles, games, math, and magic. Activities associated with the celebration include logic puzzles, magic illusions, and visual paradoxes, catering to a wide audience, even those who may not typically engage with mathematics. Events range from large gatherings to smaller, intimate groups, all focused on the joy and wonder of intellectual challenges. The day serves as an invitation for participants to appreciate the playful side of mathematics and its related fields.