It is a lot more entertaining pre-marriage, when you go to the marriage candidate's house. I decided to try view them all (or at least 4 or 5 of them) while I am wooing the Harvest Goddess. I put together a list of who each candidate celebrates with for fun.
Spoiler:
That little bit of guilt aside, I still think the pre-marriage festival is better, because you either get to spend it with the marriage candidate's family or closest friends. I got to admit, Jennifer's is my favourite because I get to spend it with Mugi and Mei too. Barley and May were always my fave villagers. Instead of a generic repetitive scene in the farmhouse, it should be the same as pre-marriage, but add the kid in too after he or she is born. That would be so funny seeing Dudley fussing over his toddler grandchild wandering around in the bar. Or seeing Saibara doting on his great-grandchild while Gray pouts that he never got treated this well. Or even Gotts being like an adoptive grandpa to the kid. Knowing that Carter would be left alone is more than enough to make me glad that I never really liked Doctor as a marriage candidate, so there is no danger of him being alone.