Based on the search results, October 17, 2023, is a Tuesday and there are several observances and holidays on this day. Some of the notable ones include:

• National Mulligan Day: This day is dedicated to giving people a second chance, even golfers.
• National Pasta Day: This day celebrates the popular Italian dish, pasta.
• International Day for the Eradication of Poverty: This day is dedicated to acknowledging the effort and struggle of people living in poverty.
• Black Poetry Day: This day celebrates the rich black culture and experience by reading black poetry.
• Global Ethics Day: This day is dedicated to promoting ethical awareness and action around the world.
• Dessalines Day: This day commemorates the death of Jean-Jacques Dessalines, Haitis first ruler, in 1806.

Additionally, there are some notable events that happened on this day in history, such as the 2023 Brussels terrorist attack and the October 2023 Israeli blockade of the Gaza Strip.