According to the common sense of this world, after getting married and buying a house, you host a feast and invite over people you're close to. Though I don't know which countries have this as their common sense, I do know that Shirone and Milis at least have this custom. If you just buy a new house, then it's fine not to hold one, but if you're getting married and buying a house, then you must host a feast. It's what people would call a wedding reception, huh?