Extra Credit--May 17th

Extra Credit due Tuesday, May 20th:

If you can figure out the significance of May 17th (what happened that would cause a people to celebrate this day) and write a summary on what you have found, I will give you extra credit for completing the challenge. Hint: it is a historical event from outside of the United States--think of a culture that I would be celebrating.

*Be sure to include as much information as possible, including the historical events that led up to it as well as the cultural events by which it is now celebrated.