Spring Festival
Spring Festival, or Chinese New Year, is the celebration of the beginning of the lunar year. It usually occurs in late January or early to mid-February.
The Chinese calendar is based on a combination of lunar and solar movements. The lunar cycle is about 29.5 days. In order to “catch up” the solar calendar, the Chinese insert an extra month once every few years (7 years out of a 19 year cycle). This is same as an extra day on leap year.
That is why, according to the solar calendar, Chinese New Year falls on a different date each year.

Mid-Autumn Festival
Mid-Autumn Festival falls on the 15th day of the 8th lunar month. At this time the moon is full, and the day is also known as the Moon Festival.
The round shape of the moon represents reunion, and this day should be spent with your family. This was originally a harvest festival. And on this day people eat round "moon cakes."

National Day
National Day, on October 1, is the most important national festival. During the celebrations, Beijing is elaborately decorated. Streets are lined with flowers and colorful flags and buntings, and red lanterns are hung on the gates of shops and official buildings.
The official reception and celebration are held in the Great Hall of the People while various kinds of performances and operas are shown at all theaters.
A grand parade and elaborate fireworks display is held in Tian'an men Square every fifth or tenth year, with a massive parade and show.

New Year's Day
In addition to celebrating the lunar New Year, Chinese people also observe the solar New Year. This is the same as other countries in the world.
Office will be off for one or few days and Chinese people could take this opportunity to have a short trip or go back home to see the families.