וַיִּקְרָ֥א מֹשֶׁ֛ה אֶל־כָּל־יִשְׂרָאֵ֖ל וַיֹּ֣אמֶר אֲלֵהֶ֑ם אַתֶּ֣ם רְאִיתֶ֗ם אֵ֣ת כָּל־אֲשֶׁר֩ עָשָׂ֨ה יְהוָ֤ה לְעֵֽינֵיכֶם֙ בְּאֶ֣רֶץ מִצְרַ֔יִם לְפַרְעֹ֥ה וּלְכָל־עֲבָדָ֖יו וּלְכָל־אַרְצֽוֹ׃
E Mosè chiamò tutto Israele e disse loro: Avete visto tutto ciò che l'Eterno fece davanti ai vostri occhi nel paese d'Egitto verso il Faraone, e verso tutti i suoi servitori e verso tutta la sua terra;
Ramban on Deuteronomy
AND MOSES CALLED ALL ISRAEL. The purport thereof is that after he finished telling them the words of the covenant he called them again, saying, “Hear, O Israel, Ye have seen etc.,” for they had not left him, since these sections are all connected.
Or HaChaim on Deuteronomy
ויקרא משה אל כל ישראל, Moses called out to the entire Jewish people, etc. Even though Moses had been addressing the whole Jewish people up until now also, he gathered the women and the children as well as the proselytes to prepare them for renewed acceptance of the covenant which is the subject of Parshat Nitzavim.
Tur HaArokh
According to Nachmanides, after Moses had completed with the spelling out of the covenant between Israel and Hashem, he proclaimed the קריאת שמע, the declaration of the Jewish faith, once more. He reminded them of their visual experience of Hashem in action. They had not yet departed from that assembly. [We might have thought that the words ויקרא משה אל כל ישראל introduce a new assembly. Ed.]