How do you like your peaches at a voch nacht?

I like hard peaches and nectarines, and plums for that matter. I like to cut them with a knife and eat them piece by piece(not the plums). My husband calls these unripe.

I don't really understand how a voch nacht in segments of the chassidishe world has become more important than the bris. As I understand it (hey, I could be wrong) a bris is a mitzva dearaysa and therefore the meal is a seudas mitzva. On the night before the bris there is a minhag for the father of the baby to learn all night in the house. How exactly did it go from that to being mekubal that women don't even go to the bris and only to the vach nacht. And that there has to be an elaborate (catered) meal at the v.n.? I understand (I think) basically how it happened. Father learning- chavrusa- food- other people stop by- women come with husbands- more food- big meal. But how did it become more important than the bris- a mitzva deoraysa?
Some things just leave me scratching my head.