Prepping food for tomorrow... Christmas

Have christmas lunch at my house tomorrow and normally when we have a big occasion/dinner I just do all the food on the day. But have realised that this time round, now with 3 kids, that will not all be possible tomorrow so am after some advice re prepping food ahead of time.

Does anyone pre-cut their salads the night before? Am worried that the tomato would go soggy in the salad and that the cucumber/capsicum might dry out? Any tips?

Same thing with fruit platter...it doesnt take long to do but was wondering whether if I cut the watermelon tonight whether that wouldnt be as nice tomorrow?

Roast vegies - if I peel and cut my potato's/carrots/sweet pot/pumpkin and put them in water overnight would they be too waterlogged for tomorrow?

Am doing garlic and chilli prawns on the bbq as a starter, do you think I could marinate them overnight? Normally I only do them for a couple of hours?

Hmmm I think thats it...any hints would be handy. TIA.:lol:

can you cut it all up but just assemble it on the day? preparation (i.e. washing, chopping etc) is usually the longest bit, so if you can get all that out of the way then it won't take long to put it all together tomorrow. Are you having family over? get them to help you out, it shouldn't be expected that you prepare everything by yourself, especially with three kids.