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Sounds like you are mad at your partner for doing this without discussing it with you first. But those visitors did absolutely nothing wrong.
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. >

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.