וְהָיָ֗ה כָּל־הַנּוֹתָר֙ מִכָּל־הַגּוֹיִ֔ם הַבָּאִ֖ים עַל־יְרֽוּשָׁלִָ֑ם וְעָל֞וּ מִדֵּ֧י שָׁנָ֣ה בְשָׁנָ֗ה לְהִֽשְׁתַּחֲוֺת֙ לְמֶ֙לֶךְ֙ יְהוָ֣ה צְבָא֔וֹת וְלָחֹ֖ג אֶת־חַ֥ג הַסֻּכּֽוֹת׃
예루살렘을 치러 왔던 열국 중에 남은 자가 해마다 올라와서 그 왕 만군의 여호와께 숭배하며 초막절을 지킬 것이라
Tze'enah Ure'enah
“All those who survived of all these nations” [14:16]. All the nations that will remain after this war will go every year to Jerusalem on Sukkot to bow down to God. The war of Gog and Magog will be during Sukkot. Therefore, the nations will make a memorial that they were protected from the war on Sukkot.
Rashi
the festival of Tabernacle As our Sages explained in tractate Avodah Zarah (3a): I have an easy commandment named Sukkah, as is stated in the first halachic discussion.