Mother asked my sister in law to bring mac and cheese since we had a ton of little ones. She showed up with her family at the appointed luncheon time with a green salad and a box of mac and cheese.
This is my question -- for a "ton of little ones" would 1 box of mac & cheese be anywhere near enough? I mean, even if there was time to make it, I wouldn't serve it in fear of not all the little ones getting a fair serving.
When the DDs were little and I was serving mac & cheese as a side dish, I would have to make 2 boxes for the 4 of us. (Okay, LDH was a big eater

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I agree. Boxed mac & cheese just does not warm well. SIL should have made arrangements, in advance, in order to have the dish prepared right before serving.
I also agree with others on the point of being asked what you would like to bring and being told what to bring. If the invitation went something like "We'd love to have you at our party, and you need to bring X-item" then that would have been rude on the hostess' part.
Another question that I have is how long has SIL been coming to these annual parties? Is this the first faux pas that she's made?
What I found was that many etiquette experts don't consider assigning a dish a potluck, it's co-hosting at that point. A true potluck is bring what you want, so you might end up with a lot of salads. But that's the risk you take with hosting a potluck.
Thanks for posting this, mj! That's where the "luck" part comes in, isn't it. Otherwise it would be a potplanned.
