The people involved in the Montgomery Bus Boycott were African American people and the famous, Rosa Parks. Rosa Parks was arrested on a Montgomery bus because she wouldn't give her seat up to a white man. She was a very important to this event, not just because she made it happen, but because it made an impact on Civil Rights and started a movement.
The people who boycotted had to figure out how to get to work, the store, and other places they may need to travel to. To overcome this obstacle, the boycotters walked, biked, and found rides from strangers.
Similarly, the Montgomery Bus Boycott and A Day Without Immigrants both were big events that led to closed businesses. The bus boycott made an impacts on the bus business and the day without immigrants closed restaurants, stores, and schools. I had a personal experience going to a closed restaurant because I was unaware of the day at the time