I absolutely agree with the two posters above. You really want to set up your boundaries now otherwise in 20yrs from now you ll be resentful.
But to show the other side of the coin - my family has more gathering than my husbands one - you have to understand (and it isnt easy i admit) which ones are important for her and which ones are important “politically”.
Let me explain. I was / or should I say I always felt like the ugly duckling in my family. So when I met my now husband 21yrs ago and started to be serious so going together at family gatherings came on the agenda, I felt finally secure and strong enough to held my own.
So my husband became my rock with which I could stand against.
So the conversation you really want to have with your fiancee is the one to understand what is the underlying issue. Maybe it makes it easier for her, maybe she wants an out and you need to help her or maybe you simply need to agree that you ll go the important ones and that sometimes she goes alone.
I have decided now we only attend the ones that I felt are important or that I felt would be fun. My sisters are sometimes upset I let them go alone (we re very good now no more ugly duckling!) so sometimes I do my bit for them but my husband may not go. I must say leaving abroad is so helpful I can always blame it on the cost of travelling
.
Bottom line, time to have an honest conversation but one in which you really try to listen and be kind to each other.
Good luck