That's Night of Joy weekend which is at the Studios this year. I've been that weekend many times, and found the crowds very light. It's one of my favorite times to go with minimal crowds, and the weather is usually starting to cool down. Most rides you will be able to walk on with no waits except during Night of Joy. They are having the first Halloween party this year on that Friday at the Magic Kingdom. I'm guessing the crowds will not be bad at that first MNSHHP, and that would be a great time to go to the MK for rides.