For the Jews, prophecy was not just predicting the future as we think of it today, but prophecy dealt with patterns that pointed to a deeper truth, a future truth. So all the Jewish feasts were not just commemorating some past event, but they were also, by their schedule and pattern, also pointing to something in the future, something prophetic.
For example, we know the Passover and Feast of Unleavened Bread was fulfilled by Jesus and the cross. But did you know the Feast of Firstfruits was fulfilled in the resurrection and the Feast of Weeks in the birth of the Church?
What about the Feast of Trumpets or the Feast of Tabernacles or the Day of Atonement. What future events do these point to? Want to know more? Then keep listening.
The following is a study on Zechariah 14:16-21 and Leviticus 23.