Fulfilled by Jesus when He was born and dwelt among us. Deuteronomy 31:10-11, Leviticus 23:33-36

Sukkot, the Feast of Booths, or Feast of Tabernacles, is a Biblical holiday celebrated on the 15th day of the month of Tishrei (late September to late October). It is one of the three biblically mandated festivals Shalosh regalim on which Hebrews were commanded to make a pilgrimage to the Temple in Jerusalem. The holiday lasts seven days (eight in the diaspora). The first day is a sabbath-like yom tov when work is forbidden. The sukkah is intended as a reminiscence of the type of fragile dwellings in which the Israelites dwelt during their 40 years of travel in the desert after the Exodus from slavery in Egypt. Throughout the holiday meals are eaten inside the sukkah and many sleep there as well.

It is highly likely that this refers to His actual birth which may have actually been during this festival. If scholars are right he would have been circumcised on the 8th day of the festival. Nonetheless the Feast of Booths points to the time when God would dwell among us regardless of when he was actually born (John 1:14).