Personally I got cabin fever when I was heavily pg and not driving with Sarah. (I had a tpl n decided that it would prob b safer 4 me not 2 drive) Even going to the shops was enough to make it go away but if I had decided that I wouldn't go to the family easter do on my due date I would have gone nuts! Your first labour may take while for you to notice that you r having contractions but you will more than likely have plenty of warning and be able to let your hair down and enjoy yourself for the party. If worst comes to worst someone will call an ambulance for you. You should be fine but the b+g will understand if u r 2 tired.