National Notebook Day is celebrated on May 21, encouraging individuals to engage in various writing activities using notebooks. Participants are invited to jot down to-do lists, journal their thoughts, or explore creative writing, emphasizing the therapeutic benefits of putting pen to paper. The day highlights the significance of journaling and its impact on mental health, as well as the resurgence of traditional writing practices in a digital age. Common customs include starting a new journal, doodling, and even transitioning from digital to handwritten notes to enhance focus. The event aims to fill the world with personal anecdotes and reflections, celebrating the art of writing and the vibrant notebook community.