We already booked ours for a Sunday just because of the way the rest of the trip shakes out however I've heard that you should avoid weekends because locals often hit up the party on a weekend where a weeknight would really be primarily traveling people. That being said anything that was the case prior to Galaxy's Edge opening is not necessarily going to apply post opening - and they may all be crowded. So my philosophy is - oh well! I'm going to have fun (it's our first time) and enjoy the shows/parades and cookies and not get hung up on the wait times/crowds.