Ki Tavo describes a participatory drama that Moses instructs the Israelites to engage in after they’ve crossed over into Israel. They are to stand half on one mountain, Mt. Gezerim, and half on another, Mt. Ebal, and commit yet again to a covenant with God. The first half recites all the great blessings that they’ll have if they follow God, and the second half gives the curses.
Only first the Levites say some stuff which looks like curses but are actually more like laws, for example (my favorite): (Deut 27:19) "Cursed be he who subverts the rights of the stranger, the fatherless, and the widow. — And all the people shall say, Amen."