“On the fifteenth day of the seventh month ye shall have a holy convocation: ye shall do no manner of servile work, and ye shall keep a feast unto H’Shem seven days.” – Numbers 29:12, JPS
The festival of Sukkot, as prescribed in Torah, included offerings for the nations for their protection from affliction. There were a total of seventy bulls offered over a period of seven days. This specifically designated amount of offerings corresponds to the primary nations mentioned in Genesis (Sukkah 55b). In the future, all of the nations will be required to worship in Jerusalem (it is likely to presume that they will send delegates). This is a sign of the Messianic Era, when Moshiach will reign from Jerusalem.
“And it shall come to pass, that every one that is left of all the nations that came against Jerusalem shall go up from year to year to worship the King, the L-RD of hosts, and to keep the feast of tabernacles [Sukkot].” – Zechariah 14:7
“And many peoples shall go and say: ‘Come ye, and let us go up to the mountain of the L-RD, to the house of the G-d of Jacob; and He will teach us of His ways, and we will walk in His paths.’ For out of Zion shall go forth the law, and the word of the L-RD from Jerusalem.” – Isaiah 2:3