Depending on JUST what weekend you are talking about. There is no Star Wars weekend the Memorial Day weekend this year. The first Star Wars weekend this year is the weekend AFTER Memorial Day.
This is because of Celebration on the west coast for the 30th of ST:ANH.
Now that is said, the crowds are can be pretty bad. It's the first long weekend of the summer, most kids are out. Plus Star Wars weekends tend to be good draw, for those nut cases that carry plastic lightsabres and have Jedi cloaks with pal mickeys with matching outfit.