We one of did the Star Wars Weekends last June with my son (then 4) my niece (6) and my nephew (10).
The kids had the most fun walking around, seeing the characters and getting photos and autographs. They even did the face painting.
If you can, try to do the Jedi Training Academy (I think that's what they called it). My son is still talking about the lightsaber "training" he received.
And we'll be back in June for the last SWW for the year.
Enjoy (and yes, bring lots of film!)