What events at Alabama State College preceded the “Heed Their Rising Voices” advertisement?

In February 1960, the city of Montgomery, Alabama, was experiencing significant civic tension that set the stage for the "Heed Their Rising Voices" advertisement. The specific events at Alabama State College that preceded the ad's publication on March 29, 1960, were as follows:

• February 25, 1960: Thirty-five students from the college attempted to seek service at a snack bar located in the basement of the Montgomery County Courthouse. They were refused service and subsequently arrested.1
• February 26, 1960: Governor John Patterson, serving as the ex officio chairman of the state board of education, demanded that the students involved be expelled from the public college.1
• February 28, 1960: In response to the governor's actions, approximately 800 students from Alabama State College marched to the state capitol to protest. During this demonstration, members of the Ku Klux Klan assaulted the students while local police stood by and did not intervene, despite the presence of photographic evidence of the attackers.1