Check out these links for fun/educational activities for MLK day -
A Teeny Book: http://www.bry-backmanor.org/mlk.html
Timeline in Kidpix slides: http://www2.lhric.org/pocantico/taverna/98/1.htm
Many links and lessons: http://www.gpschools.org/ci/ce/elem/holidays/mlkk5.htm
http://www.apples4theteacher.com/holidays/martin-luther-king-jr-day/printables/