Lantern Festival is Chinese traditional festival which is 15th day of the 1st lunar month.
The 15th day of the 1st lunar month is the Chinese Lantern Festival because the first lunar month is called yuan-month and in the ancient times people called night Xiao. The 15th day is the first night to see a full moon. So the day is also called Yuan Xiao Festival in China.
Wish you and your family a happy Lantern Festival !