You can center around the "I have a dream" speech.
Art Idea:
There is construction paper available in "flesh tones" which is great for some sort of multicultural project.
This would also be a great chance to brainstorm a make a difference project with your kids.
Music ideas:
Bryan Sirchio has a song "Dream God's Dream" which I really like. It could be used with the "I Have a Dream" speech. You can down load words and lead sheets free, and/or purchase the CD containing the song at his website https://bryansirchio.bandcamp....ack/dream-gods-dream. Our youth wrote an extra verse to the song, which went over very well.
The gospel hymn "Precious Lord, Take My Hand" was MLK favorite and he requested it just before his assassination. I believe an additional verse was written. Can't find it and don't remember it all, but the third line was something along the lines of "I have dreamed a great dream, that your love will fill our land."
Also for the rocker set, U2 "In the Name of Love" could be used.
Hope this helps!
Peace,
Lisa