Up to Chapter 13 in To Kill a Mockingbird, what are the five most important events?

In To Kill a Mockingbird, the five
(5) most important events before chapter 13 are, in order of
importance:

1) Atticus agrees to defend Tom Robinson.  This
causes anxiety for the family: Scout gets in trouble at school.  Aunt Alexandra will
have to come to live with them.  This event sets up the entire second half of the
book.

2) Jem nearly gets shot by Nathan Radley as he
retrieves his pants.  Jem nearly dies, but it shows how desperate he is not to
disappoint his father.

3) Scout begins school.  Her first
grade year is spent spinning her wheels.  She learns nothing and only gets in trouble
for trying to help.  The education system is backwards, much like the social outlook of
the town.

4) Arthur Radley takes an interest in the kids,
and vice versa.  They try to get him to come out, and he does: he leaves soap carvings
for them.  Little do the know that he will serve as a protector for them.  He is the
grey ghost who will save Jem and Scout at the end.
 Foreshadowing.

5)  Jem and Scout go with Cal to her
church.  The kids see how tight the black community is as they raise money for Tom
Robinson's wife.  This field trip is invaluable: the kids learn more from Cal than they
do in any other setting up until now.