Night out away from breastfeeding baby

I plan on breastfeeding. I also plan on pumping for those nights that I want a glass of wine or sleep :) but, I have read that you shouldn't start introducing a bottle till about 4-6 weeks or 6-8 weeks depending on if everyone has the feeding down. Anyway, we have a Christmas dinner planned for my husband and I to go to and my mother will be watching the baby. Thing is, if he comes on his due date, he will only be 4 weeks old, so chances are he won't be on a bottle yet. We would be away from the baby for about 3-4 hours. Is this doable? I'm afraid that even if I feed him before we go, he will need to be fed before we get back.