I read The Liturgical Year: The Spiraling Adventure of the Spirit, by Joan Chittister. I was looking forward to it because I wanted to know more about that. When I attended a Presbyterian church they observed certain parts of the liturgical year and I enjoyed participating in Ash Wednesday, Lent and Advent, so I was looking forward to learning more about that.
I found this book a bit dry and not as in depth as I would've liked, but still a good introduction. It did not compel me to want to seek out observing the liturgical year and it still left me with questions.
Note: Per the FTC Guidelines, I am disclosing that I received a free copy of this book from the publisher, Thomas Nelson.