I'm worried about this too - not MLK weekend, but the Builders' Convention. We have reservations for January 9-12 at Boardwalk Inn and January 12-14 at Portofino Bay. I was so hoping that we had chosen a great time for our trip, but, alas, I'm quite concerned about these 110,000 conventioners descending on Orlando while we're there. The airport alone could be a nightmare. I'm not as worried about the parks during the day because the convention folks will most likely be at the convention. However, evenings could be bad - think Downtown Disney - oy! Also, there could be private events at any one of the parks - either WDW or Universal. I'm thinking about canceling our trip. We've been to WDW and Universal many, many times, so the world won't end. We'd be disappointed, but I'm not sure I want to spend all that money and fight those crowds.