What does it mean to celebrate Zhengri in Cantonese?

Weddings or new houses in Guangdong should be celebrated for three days. The first day is to open the kitchen, that is, people who come to help eat and keep warm. The next day is opposite to Japan, which is the most formal day. It's usually a calculated auspicious day. On the third day, the kitchen was closed, that is, the helper had dinner, and the activity was a complete success.