What do your characters like to remember and why? What do they choose to deliberately forget and why? Are they successful in "forgetting"? When someone confronts them so they have to remember, what is their attitude? Resentful, fearlful?
What do the governments/ruling authorities seek to officially remember and forget? What official ceremonies are there and is it compulsory for people to attend these things? Are there alternative, underground events and how successful are these?