Leviticus23:33 And the Lord spake unto Moses, saying,
34 Speak unto the children of Israel, saying, The fifteenth day of this seventh month shall be the feast of tabernacles for seven days unto the Lord
35 On the first day shall be an holy convocation: ye shall do no servile work therein.
36 Seven days ye shall offer an offering made by fire unto the Lord: on the eighth day shall be an holy convocation unto you; and ye shall offer an offering made by fire unto the Lord: it is a solemn assembly; and ye shall do no servile work therein.
39 Also in the fifteenth day of the seventh month, when ye have gathered in the fruit of the land, ye shall keep a feast unto the Lord seven days: on the first day shall be a sabbath, and on the eighth day shall be a sabbath.
40 And ye shall take you on the first day the boughs of goodly trees, branches of palm trees, and the boughs of thick trees, and willows of the brook; and ye shall rejoice before the Lord your God seven days.
41 And ye shall keep it a feast unto the Lord seven days in the year. It shall be a statute for ever in your generations: ye shall celebrate it in the seventh month
42 Ye shall dwell in booths seven days; all that are Israelites born shall dwell in booths
Nehemiah8:14 And they found written in the law which the Lord had commanded by Moses, that the children of Israel should dwell in booths in the feast of the seventh month:
15 And that they should publish and proclaim in all their cities, and in Jerusalem, saying, Go forth unto the mount, and fetch olive branches, and pine branches, and myrtle branches, and palm branches, and branches of thick trees, to make booths, as it is written.
16 So the people went forth, and brought them, and made themselves booths, every one upon the roof of his house, and in their courts, and in the courts of the house of God, and in the street of the water gate, and in the street of the gate of Ephraim.
17 And all the congregation of them that were come again out of the captivity made booths, and sat under the booths: for since the days of Jeshua the son of Nun unto that day had not the children of Israel done so. And there was very great gladness.
18 Also day by day, from the first day unto the last day, he read in the book of the law of God. And they kept the feast seven days; and on the eighth day was a solemn assembly, according unto the manner.
When the time comes to celebrate the Feast, we as Israelites do leave our homes and sleep outside in tents to try and keep the custom to the best of our ability
The Book of Numbers29:12-38 gives the breakdown of each day and how and what sacrifices were done during the Festive Week. According to the Old Testament these sacrifices must to take place in the order it was given. Although we MUST keep the feast, the scriptures let us know that Christ was our last sacrifice so we no longer have to offer animal sacrifices to the Lord during that week.