There are LOTS of books out there that cover the so called wheel of the year, which is almost always some wiccan derivative.  It's a formula of times and events that you are supposed to hold holy.  Some even explain the myth and history of the holidays, but precious few books actually look at something very important: how to connect with the Holy Days.

People had celebrations on given days and at given times because it was significant in their lives.  You celebrated the first planting because that meant you had your first opportunity after winter to sow the seeds that will comes that year's harvest.  You celebrated the harvest because it meant you'd eat during the cold winter months. Then there is all the personal mythology associated with these events, which also carried a potent and personal meaning.

But books can't give you that.  Its something you have to establish fro yourself.  And NOTHING says that what you come up with has to follow specific Wheel (unless of course you're claiming to be part of a specific religion with set holy days, but that's another rant for another time).  Instead of picking up a book and observing the days it tells you, put the book down and start to REALLY think about what makes a given day special and worthy of note.  Come up with your own mythology and related reasons.  Make your own wheel of the year for your personal path and watch how much more significant the celebration your practice become.