The 7 feasts of Israel mark 7 special times or periods for the nation to remember God by.
They help the people to rest and to remember how God saved them, led them, provided for them, & forgive them.
This yearly calendrical observance also marks them out as a holy people unto God.
But from another angle (informed by the New Testament authors/ apostles), we can see the 7 feasts from a Christological persepective too. In other words, these feasts are pictures that point us to Jesus Christ! Come and see how they manifest His person & work in both His 1st Coming and 2nd Coming, and learn that God honours His Son in the calendar of world history.