This Day in History

The First Father's Day (1910)
Father's Day is a day set apart in many countries for honoring fathers. In the US, UK, and Canada, it is observed on the third Sunday in June. The idea for a father's day originated when Sonora Louise Smart Dodd of Spokane, Washington, heard a sermon on Mother's Day in 1909 and was inspired to create a date to honor fathers like her own, a Civil War veteran. Through her efforts, the first Father's Day was celebrated in Spokane in 1910. When was the holiday made official in the US? Discuss

Li Yuan Becomes Emperor Gaozu of Tang (618 CE)
Emperor Gaozu was the founder of the greatest of China's imperial dynasties, the Tang dynasty (618-907 CE), which ruled over what was then the world's largest empire and initiated a golden age for art, science, and Buddhism. Before becoming emperor, Li Yuan, as he was then known, was governor of a province under the Sui Dynasty. When the Sui emperor, Yangdi, was assassinated in 618, Li Yuan reunited the empire and took power. Why did he later abdicate the throne in favor of his son, Li Shimin?

The Night Attack (1462)
The Night Attack was a battle fought between the forces of Wallachian Prince Vlad III, known as Vlad the Impaler, and the forces of Mehmed II, sultan of the Ottoman Empire. After Vlad raided Bulgaria and killed more than 20,000 Turks and Bulgarians, Mehmed marched on Wallachia, and the two powers fought a series of skirmishes. In the Night Attack, Vlad attacked the Turkish camp in an attempt to assassinate Mehmed. The attempt failed, but Mehmed retreated anyway. Why?