Hmmm, the middle of the week and posible rain? I say GO! It may be less crowded and you may even be able to see the displays and wander around the Christmas tree!
I was there yesterday (on a bus trip with family) we live close enough that our park and rides go into the city, but I'll tell you what, NEVER again! I will never go on a weekend around the holidays! It was so crowded you could barely move, crossing the street was like a cattle call, with the police telling people to hurry up get on the sidewalk! There was no place to go, and I had my 2 youngest with me! (It was their first time in the city, so they thought it was always like that, had fun anyway because they expected alot of people)
After saying all of that, the decorations were beautiful, but next year I will only go during the week!