Spreadsheet Day is celebrated annually on October 17th, recognizing the significance of spreadsheets in organizing data and making decisions in both personal and professional contexts. This day marks the debut of VisiCalc, the first spreadsheet program for personal computers. Observers appreciate spreadsheets by exploring their history, wearing grid-patterned clothing, and even baking cakes designed to resemble spreadsheets. It serves as an opportunity to engage with educational resources, particularly for students and educators, and encourages individuals to organize their lives using spreadsheets. The celebration highlights the evolution and impact of spreadsheets on daily tasks and decision-making processes.