Why don't Christians celebrate the feast of tabernacles?

Although there are some who celebrate the feast of Tabernacles they are definitely in a minority. A prophecy in Zechariah speaks of a time when *all nations* will have to keep the feast: > Zech 14:16 And it shall come to pass, that every one that is left of all the nations which came against Jerusalem shall even go up from year to year to worship the King, the Lord of hosts, and to keep the feast of tabernacles. And it shall be, that whoso will not come up of all the families of the earth unto Jerusalem to worship the King, the Lord of hosts, even upon them shall be no rain. 18 And if the family of Egypt go not up, and come not, that have no rain; there shall be the plague, wherewith the Lord will smite the heathen that come not up to keep the feast of tabernacles We know that Jesus celebrated it (John 7:2) and if we believe the prophecies then we will keep the feast again in the future. The current period of not celebrating appears anomalous. Why don't Christians generally celebrate Tabernacles now?