Danni..Dont know what your relationship is like with your MIL, but has she just arranged dinner without thinking about things you cant eat, I guess it would have been a long time since MIL was pregnant. And back then things were probably a lot different. Have you spoke to her about it?

Or is she very well informed and doing this to make life diffcult?

You could take a frozen dinner meal in an esky and heat it up when you get there ROFL 8 mins and your meal is all ready.