As a pure hypothetical, I guess it is theoretically possible that a government, upon learning that they failed to provide notice to concerns citizens who would have convinced them not to enter into the agreement decides to own up to their error and pursue the challenge on behalf of their citizens. But you’d still have aggrieved persons.
it’s not hypothetical. It’s recommended the local government hold rehearings to fix the failure to provide notice
From the state’s Sunshine Law guide:
Where, however, a public board or commission does not merely perfunctorily ratify or ceremoniously accept at a later open meeting those decisions which were made at an earlier secret meeting but rather takes “independent final action in the sunshine,” the decision of the board or commission will not be disturbed. Tolar v. School Board of Liberty County, 398 So. 2d 427, 429 (Fla. 1981). Accord Bruckner v. City of Dania Beach, 823 So. 2d 167, 171 (Fla. 4th DCA 2002) (Sunshine violations “can be cured by independent, final action completely in the Sunshine”). And see Monroe County v. Pigeon Key Historical Park, Inc., 647 So. 2d 857, 861 (Fla. 3d DCA 1994) (adoption of the open government constitutional amendment, Art. I, s. 24, Fla. Const., did not overrule the Tolar “standard of remediation”). Cf. Board of County Commissioners of Sarasota County v. Webber, 658 So. 2d 1069 (Fla. 2d DCA 1995) (no evidence suggesting that board members met in secret during a recess to reconsider and deny a variance and then perfunctorily ratified this decision at the public hearing held a few minutes later); B.M.Z. Corporation v. City of Oakland Park, 415 So. 2d 735 (Fla. 4th DCA 1982) (where no evidence that any decision was made in private, subsequent formal action in sunshine was not merely perfunctory ratification of secret decisions or ceremonial acceptance of secret actions).
Thus, in a case involving the validity of a lease approved by a board of county commissioners after an advisory committee held two unnoticed meetings regarding the lease, a court held that the Sunshine Law violations were cured when the board of county commissioners held open public hearings after the unnoticed meetings, an effort was made to make available to the public the minutes of the unnoticed meetings, the board approved a lease that was markedly different from that recommended by the advisory committee, and most of the lease negotiations were conducted after the advisory committee had concluded its work. Monroe County v. Pigeon Key Historical Park, Inc., 647 So. 2d 857, 860-861 (Fla. 3d DCA 1994).
Similarly, a school board remedied an inadvertent violation of the Sunshine Law when it subsequently held full, open and independent public hearings prior to adopting a redistricting plan. Finch v. Seminole County School Board, 995 So. 2d 1068, 1073 (Fla. 5th DCA 2008). And see Sarasota Citizens for Responsible Government v. City of Sarasota, 48 So. 3d 755 (Fla. 2010) (any possible violations that occurred when county commissioners circulated e-mails among each other were cured by four subsequent public meetings involving discussion of multiple proposals); Jackson v. City of Tallahassee, 265 So. 3d 736 (Fla. 1st DCA 2019) (public city commission meeting to fill a vacancy on the commission, which included a full discussion of the appointment, candidate presentations, more than an hour of public comment, and numerous speakers, cured any purported violation that may have occurred during the application process). Cf. Anderson v. City of St. Pete Beach, 161 So. 3d 548, 553-554 (Fla. 2d DCA 2014), noting that “even when an illicit action is ‘cured’ it does not absolve a public body of its responsibility for violating the Sunshine Law in the first instance; it simply provides a way to salvage a void act by reconsidering it in Sunshine.”
It must be emphasized, however, that only a full open hearing will cure the defect; a violation of the Sunshine Law will not be cured by a perfunctory ratification of the action taken outside of the sunshine. Spillis Candela & Partners, Inc. v. Centrust Savings Bank, 535 So. 2d 694 (Fla. 3d DCA 1988). See also Anderson v. City of St. Pete Beach, 161 So. 3d at 553 (city failed to cure Sunshine Law violation since it merely perfunctorily ratified in public session what had already been decided in closed meetings).