what is a lunar month? how to find dates of festivals by looking at it?

Deshji, a lunar month starts from Chu Yi or Shuo Ri (the first day of a lunar month) and ends at next Chu Yi or Shuo Ri. Sometimes, it is as long as 30 days. Somtimes, it's just 29 days. When the moon moves into line with the earth and the sun, a new month begins. Then we call this day Chu Yi or Shuo Ri.

In fact, many traditional Chinese festivals fall on the fixed dates, according Chinese lunar calendar. For example, Mid-Autumn Day falls on April 15. You just need to remember when the festivals begin. If you look at modern Chinese calendar, you will find that it's a combination of Chinese lunar calendar and Gregorian calendar. And the festivals are marked.