It's a weird holiday. Happens in the middle of January on a Monday. Most people are still broke from Christmas. I wish they'd do away with the holiday and move it to the spring. I get 7 holidays a year, and 4 of them happen in a 3 month period (Thanksgiving, Christmas, New Years, MLK), and then I get nothing until May. I do have personal days, but it's just weird.
I've never heard of it being crowded, so you have nothing to worry about.
The day itself is on Monday the 15th.