And upon reviewing Leviticus 23, I see they are mostly celebrated with a lot of barbecue. I can work with that.
Interesting review from 1894 of the Old Testament including Leviticus:
http://www.infidels.org/library/historical/robert_ingersoll/about_the_holy_bible.html
It would be good, but you don't have to. Read Hebrews next and see why animal sacrifices are no longer needed...