The events of Rogue One are of vital importance in the history and the subsequent success of the Rebel Alliance. I won't go into the details here, we know that the successful mission to steal the Death Star's plans allow the Rebels to discover and exploit its weak spot.
At the same time, the characters involved with this mission could be safely described as true heroes, having sacrificed even themselves in order to accomplish their mission.
In-universe, is there a reason why not the events nor the characters are ever referenced again?
The secrecy of the mission itself was a vital aspect in order to accomplish it, so one could argue that publicly celebrating those that were involved could be harmful (if you have secret information about your enemy, you don't want them to know that you do).
But in the movie ending, we learn that the Empire is aware that the Rebels posses the plans, and that a Rebel commando was present and successful on Scarif, so the secrecy is no more a factor to be taken in consideration.
In-universe, why aren't the heroes that made possible the ultimate Rebel victory referenced, celebrated, or otherwise remembered in later times? What is the reason to still keep the secret?