Purim is unique in that it will remain fully valid even in the time of Geula, as Rambam says regarding the eternal nature of Purim: “Even though all memory of troubles will be eliminated, as it is said ‘For the former troubles are forgotten and hidden from my eyes’ – the days of Purim will not be canceled. As it is written, ‘And these days of Purim shall not pass from among the Jews, and their memory shall not cease from their descendants.’”