There's no shortage of information for ideas on how to spend the holiday. Mainly, we favor a mix of commemoration & service. If you agree (or would like to find out more), check in at the MLK Day of Service page at Serve.gov.
If you will be child-wrangling on Monday (or anytime this three-day weekend), check out the excellent ideas, cute photographs & free download printables at Preschool Daze. It's absolutely wonderful. We applaud Kristin for her generosity.