MIL always invites us last minute

I get super annoyed by this. Mainly because she has 3 kids and her other two have 5 kids between them and me and my SO are childfree.

So she will invite the ones with kids to stuff way in advance and then me and my SO always seem to be an afterthought.

MIL just invited us to a bonfire on Sunday with everyone. Today is Friday. Then they act all shocked and offended when we never go to these gatherings.

I already have plans this weekend so that’s why we won’t be going. But often times we just don’t go because last minute plans are a bitch and I hate feeling like an afterthought or less of a priority because we don’t have screaming children to contribute to the event.

MIL always invites us last minute