“我知道的节日多着呢！”用英语怎么说？

I know alot about festivals .

i know about so many festivals

I knew the holiday are being many

The festival that I know be many indeed!
应该是的.

The festivals (which) I know about are numerous/countless.

注意：numerous/countless 无数的, 数不尽的
the festivals (which) I know about 我知道的节日