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To be clear, they asked my partner. I was not involved in the asking process. This was supposed to be small, low key, because I still have a lot of work responsibilities. If they were just going to be at the party, cool, no problem. But they're at my house. Multiple days. They're staying here. That's a little more than a one-off.
They asked for an invitation and it was given. They were told to come. If you did not want them there you should not have invited them.