SIL invited us over for Christmas.
She initially said she had a surprise for us, so I'm unsure whether it is actually a change of plan or if it was the surprise all along.
She just told us that instead of hosting the Christmas Dinner at hers and bil's, we would go out to Karen's dinner to have dinner there (it is apparently open tomorrow afternoon!)
She also asked us not to explain the concept of Karen's diner to my parents and PILs.
So she essentially wants this to be a huge prank and thinks it would be hilarious. She likes trends and I guess wants to follow this one but I think it's taking it too far. She's got a few thousand followers on her Tiktok account, so I'm assuming she wants to film the experience for views (it wouldn't be the first time).
AIBU to be miffed as it essentially means no one has done any Christmas food shopping (besides sides and drinks that we were planning on bringing) and gutted we would be eating fast food burgers and to think this is not funny at all?