October 21, 2023, is a Saturday. There are no major holidays or observances in the United States for this date. However, there are several observances and events happening around the world, including:

• Trafalgar Day
• International Day of the Nacho
• International Sloth Day
• Back To The Future Day
• National Sweetest Day
• Apple Day
• Babbling Day
• Bridge Day
• Celebration of the Mind Day
• Check Your Meds Day

These are just a few of the many observances and events happening on October 21, 2023.