Hey I remembered that I mentioned that I would explain how and why everyone forgot Sasuke and how they just suddenly remembered.
Well since I had no time to get to that part of the story and stuff since real life is too busy, I will explain it right here right now!
Well it's simply because Itachi used a jutsu to erase the entire village's memory of him and used a genjutsu on the records of Sasuke in the village. However after Sasuke killed Itachi it took about a week to undo the jutsu and everyone slowly regain their memory.