Ohhh gotcha, I assumed I couldn’t turn them in until I had all the masks, I talked to the Director when I had 1 mask and said nothing so I just didn't tried again. Now that I think of it I didn’t try interacting with the small stage next to him either, so I will do that once I’m back at my computer.
Edit: Went back and managed to finish, struggled a bit with the mask rooms puzzles but eventually got it.