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The gemara our daf (Megillah 31b) explains that Ezra Hasofer established the practice of reading the klalos sheb'Toras Kohanim, the curses found in Vayikra (26) before the yom tov of Shavuos, and those of Sefer Devarim (28) prior to Rosh Hashana. Tosafos add, in the name of Rabbeinu Nissim, that the klalos of Sefer Devarim, which begin in Parshas Ki Savo, include part of Parsah Nitzavim as well. Because of this takonas Ezra, we always read Parshas Nitzavim on the Shabbos before Rosh Hashana.
The Gaon of Vilna highlights an essential difference between the tochacha found in Vayikra and the berachos u'kallos of Devarim. The tochacha in Vayikra is formulated in the plural, "im b'chukosai timasu", addressing kol echad v'echad, each individual member of Klal Yisroel. The berachos u'klalos of Sefer Devarim, however, which are statements in the singular, embrace the totality of Keneses Yisroel.
We explore the blessings and curses twice listed in the Chumash