I mean, maybe it's a cultural thing (I'm from Eastern Europe), and I certainly approve of parents spending more time with their children and vice-versa, but I personally don't see my extended family getting in a group of 20+ people and spending more than a couple of hours together without a major fight starting in less than half a day.

It's either fights about who's going to inherit what (and we're not talking about the Taj Mahal, but about a stupid piece of agricultural land in the middle of nowhere), or some grand-mother accusing her only daughter who went to college of "you could have done much better! and why did you have to marry X?" (with X, the son-in-law, being present, together with said couple's kids) followed by the grand-father from the other side of the "family tree" accusing X of marrying "bellow their family status", and so on and so forth.