Final answer:
The Montgomery Bus Boycott was an organized protest against bus segregation in Alabama, starting on December 5, 1955, and ending with a Supreme Court decision against bus segregation on December 20, 1956.
Step-by-step explanation:
The organized event to protest bus segregation in Alabama was the Montgomery Bus Boycott. This was a pivotal episode during the Civil Rights Movement and involved significant figures such as Rosa Parks, Martin Luther King Jr., and E. D. Nixon. The boycott started on December 5, 1955, and lasted 381 days, ending with the Supreme Court ruling that bus segregation is unconstitutional.
Inspired by Rosa Parks' refusal to give up her seat to a white passenger, the black community, spearheaded by leaders like Parks, Dr. Martin Luther King Jr., and E. D. Nixon, initiated the boycott. They formed the Montgomery Improvement Association (MIA) to organize their efforts. Their nonviolent protest demonstrated the financial and moral power of the African American community, eventually leading to the end of legal bus segregation in Montgomery.