October 13, 2023 is a Friday. Here are some events and observances that are happening on this day:

• National Train Your Brain Day: This day encourages people to keep their brains sharp and improve their minds through healthy habits such as doing crossword puzzles, studying a foreign language, or trying logic puzzles.

• Metastatic Breast Cancer Awareness Day: This day focuses on raising awareness about metastatic breast cancer, a type of breast cancer that has spread to other parts of the body.

• National No Bra Day: This day is observed to raise awareness about breast cancer and encourage women to go braless for the day.

• National Yorkshire Pudding Day: This day celebrates the traditional British dish of Yorkshire pudding, which is typically served with roast beef.

• Day of respect for cultural diversity: This day honors the indigenous people of the Americas on the date when Columbus first set foot in the Americas.

• Prince Louis Rwagasore Day: This day marks the assassination in 1961 of a Burundi nationalist and prime minister.

• Ancestors Day: Pchum Ben, also known as Ancestors Day, is a Cambodian religious festival which culminates on the 15th day of the tenth month in the Khmer calendar, marking the end of the Buddhist lent.

• International Day for Disaster Reduction: Also known as IDRR Day, International Day for Disaster Reduction, and International Day for Natural Disaster Reduction, this day is observed annually on October 13th to raise awareness about disaster reduction and risk management.

• Navy Birthday: This day celebrates the birthday of the United States Navy, which was founded on October 13, 1775.

In addition to these events and observances, there were also some news stories and historical events that occurred on October 13, 2023. For example, there were anti-Israel protests in many cities across the Middle East, and a teacher was killed in a school stabbing in Arras, France.