China is a multi-ethnic country with 56 officially recognized ethnic groups. Every nation has its own unique culture and traditional festivals. The following are some important festivals of various ethnic groups in China:

1. Han nationality: The Han nationality is the largest ethnic group in China. The main festivals are Spring Festival, Tomb-Sweeping Day, Dragon Boat Festival, Mid-Autumn Festival and National Day.

2. Tibetans: An important Tibetan festival is the Tibetan New Year, also known as Dongba Festival, which is usually held between the 15th and 25th of the first lunar month.

3. Korean nationality: The important festivals of Korean nationality are New Year's Day, Mid-Autumn Festival and Mid-Autumn Festival. They also have their own traditional festivals, such as Ox King Festival and Social Day Festival.

4. Dai people: The important festival of the Dai people is loi krathong, also known as the Songkran Festival, which is usually celebrated between April 14 and 16 of the lunar calendar.

5. Uighurs: The important festival of Uighurs is Eid al-Adha, which is celebrated on the first night after Ramadan when the stars appear.

6. Yi nationality: The important festival of Yi nationality is Torch Festival, which is usually held between October 24th and 26th of the lunar calendar.

This is only a part of the important festivals of all ethnic groups in China, and each ethnic group has more unique festivals and celebrations. These festivals not only enrich the culture of China, but also show the diverse national charm.