The most important moment was when the kids sat in on Atticus' speech. It was important because it showed the kids how unfairly black people are treated and how good their father is at his job, even though he doesn't always win. I think it also gave them a better understanding of why they were being treated poorly because of their dad defending Tom. This event was an example of moral education because they learned from his speech.
A unique important moment was when Jem and Scout went to Calpurnia's church. I think it was unique because the kids were white and the church was for blacks. White kids in a black church is a rare scene and not an okay thing to do, which is why I thought it was unique. This event was an example of innocence of youth because they didn't think it was bad.