That's not an overstatement. As I said, these are only the main ones. There are many others.
你这样说一点也不夸张,我只是说了几个重要的节日,还有很多没有提及呢。
To answer the first part of your question, I'd like to say that our studies were very extensive.
你问题的第一部分,我要说的就是我们的研究非常广泛。