I agree that Friday is likely to be very busy with that being the actual 60th anniversary day. My guess is that you'll see an uptick in crowds on Thursday as well as folks traveling for a long weekend arrive and because of the merchandise releases on the 16th. I suspect the rest of the week (Tue and Wed, in the OPs case) will be more like a typical July week; busy, but not capacity level crowds. I think that as long as you go knowing that it will be busy (because it is summer), you should be able to have plenty of fun.