They have Osbourne Lights every night at MGM beginning day after Thanksgiving I believe. There is no extra charge.
MVMCP usually begins the Sunday after Thanksgiving and is scheduled on selected days until Xmas week. Last year MVMCP dates were on Sun, Tues, Thurs and Fri.
So you probably will have several dates to choose from.
Last year only Fridays sold out. I was able to buy tickets for a Tuesday night the same day. I waited because the weather was very iffy, some nights were torrential rains. If you don't want a Friday night, you can probably wait until close to the date. Even the Friday nights didn't sellout until November.