1. is the host, and celebration is the celebration. Now the four clean-ups generally refer to the company's four clean-ups day, which is the day when the company was established, equivalent to the company's birthday.

2, the four clean-ups every year, like a person's birthday. However, many companies do not celebrate every year, and generally choose special days such as 10 anniversary, 20th anniversary or 30th anniversary to celebrate.

3. Generally, many companies will hold various parties during the celebration, and invite employees to participate to celebrate the company. The activities are colorful.