A vigil was held at the Old Town United Methodist Church.
Speakers at Tuesday's vigil highlighted Dr. King's "I Have a Dream" speech.
One of the speakers was there in Washington, D.C. in 1963 when King gave that speech. He said it's still important today to talk about civil rights issues, and to work to make sure people of all races and backgrounds are treated equally.
"Think about walking in that individual's shoes and it'll be easy for you to act in loving ways," said Jim Varner, the president of Maine Human Rights Coalition.
The vigil was held Tuesday because it would have been Martin Luther King's ninetieth birthday.