La. Stat. tit. 33 § 263
Any cause or right of action to contest the validity of the special election shall be prescribed after a period of sixty days from the date of the promulgation of the result of the election. If the validity of the election has not been judicially raised within this period, no court shall thereafter have authority to inquire into the matter. After the sixty-day period, if it appears from the proces verbal of the canvass of election returns provided for in R.S. 33:262 that a majority in number and amount of the taxpayers entitled to vote at the election have voted in favor of surrendering the charter and dissolving the corporation, and if no judicial contest thereof has been entered, the Governor shall issue his proclamation, declaring the charter of the corporation surrendered and the municipality dissolved.
La. R.S. § 33:263