Need help on what day for mvmcp

[buzz2400]

I am going form 12/2/05-12/11/05. I was going to pick sunday, 12/4 so in case it rains or something else happens I can beg disney to let me go on 12/6 but I see that mgm has the extra evening hours and am wondering if I will have enough time to look at the osborne lights on another night that I go to MGM (regular hours). Should I just keep my original plan and do the party on 12/4 and hope I have enough time to do the osborne lights when I visit mgm on a regular day. any comments will be appreciated.