Feast of Tabernacles was instituted by God so that people would remember that They Dwell in places with God.
It is the only feast not yet fulfilled prophetically.
The book of John makes reference to it. The seventh month of the Jewish calendar is the month of the Feast of Tabernacles. John 1:14, speaking of Jesus as the Word, says: “And the Word became flesh and dwelt among us, full of grace and truth.” The word “dwelt” that is used here is the Greek word “skenoo” which literally means “to tabernacle”! Perhaps at some point Jesus and his mother discussed with John the time of his birth. It's very possible after Jesus gave his Mother to John they had just such a conversation. Jesus was very likely born during the feast of Tabernacles. It's a well established theory. Not one to build a church around, but one to be aware of.
Jesus declared his divinity from the porch of the Temple on the last day of the feast of Tabernacles.
John 7: 37 On the last and greatest day of the Feast, Jesus stood and said in a loud voice, “If anyone is thirsty, let him come to me and drink. 38 Whoever believes in me, as the Scripture has said, streams of living water will flow from within him.” 39 By this he meant the Spirit, whom those who believed in him were later to receive. Up to that time the Spirit had not been given, since Jesus had not yet been glorified. 40 On hearing his words, some of the people said, “Surely this man is the Prophet.” 41 Others said, “He is the Christ.”
It was at that point where people took sides, where they declared their devotion or opposition. It's still going on today.
Now a couple thousand years later once more the last day of the feast is upon us. It's the day of the water offering. The day Jesus tipped over the water jars and let the water flow down the steps. He declared out of YOUR belly will flow this water. So let's do that. The great day ends tonight at sundown. It would be a good day to give an offering of the living water from your belly as the sun sets. Even if just for a little while. I will.
One last thing, many, including me believe that THIS is the day upon which the glorious appearance will take place, HE will once again be standing no longer at the temple pouring out water, but on the portico of Heaven for all to see pouring out His Glory upon all flesh...seeing it together as has been prophesied in Isaiah. We haven't yet seen this. I may see it before you do. I believe we all will and if my guess is right, it will be today, or next year, or the year after that or.... the Trumpet will sound and then... in this time of the high holy days. The Trumpet Sounds at the beginning of the Feast of Trumpets. Hear its mighty sound of victory.
I know many people have forgotten their Jewish roots..but I don't know how you can if you even give a cursory read to Romans 11. I don't "KEEP" the feasts, I honor them in remembrance. There is rich reward in doing so.
As for me, I honor Recognition of Him bringing ME out of my Egypt, of His leading me beside the waters still, of His birth and dwelling among ME, of His declaration that HE is MY source of everything and that HE will come again...in Glory.
Happy Last Day of the Feast (and Columbus day)