Conversation so far:
What part did she play in changing the law?
Parks said, "My resisting being mistreated on the bus did not begin with that particular arrest.
I did a lot of walking in Montgomery..
When did the bus incident occur?
One day in 1943.
Did she give up her seat?
CANNOTANSWER.

Question: What occured on the bus?
Self-contained rewrite: What occured on the bus in Montgomery?