Yeah, as I mentioned above, she apparently didn't realise it was public until after consultation with her FB-savvy daughter. I know you see her posts, but your FB use is sporadic enough I thought you might've missed this one. (I didn't see it myself until after she'd left me a cryptic phone message.)

So if you've read her post, you know Sis' objection was more basic: Why does this have to be a catered sit-down dinner at all? Most families (her in-laws included) don't do that. You'd think businesspeople would be more attuned to the pitfalls of groupthink and failing to get buy-in from stakeholders.