eid is coming up...invite your MIL and FIL over along with another family. They will stay polite in front of the other family. Call MIL/FIL at the last minute so they don't have a lot of time to talk about it and cause a prob. You can just tell your husband k haan meri kal baat hori thi tho maine kaha k eid ka din hai..inhe bhi bula leti hoon..like it happened casually...and make sure the other aunty who is there is someone who gets along very well with your MIL.