My girlfriend (26f) invited guests to stay without discussing it with me (28m) first?

Over Christmas both my girlfriend and I are off work from 24th December-6th January. Pretty much every day between Christmas Day and New Year's Day we have plans.

We're seeing family separately on Christmas Day and Boxing Day then going away for two nights together then seeing my girlfriends family on New Year's Eve and New Year's Day. This means I'm only able to relax between 2nd-6th.

I mentioned it my gf that since were so busy all week, I'll need the last 3-4 days to just relax and stay home. I said I'd probably spend it playing video games, reading and watching tv. I mentioned that I'd be fine going out for a meal on the evening on one of the nights but I don't want to do much else.

She said she understood then a couple of days ago she mentioned her friend who lives out of town is coming to town to see family over Christmas and new year. She said she's invited her friends and her friends boyfriend over for food, drinks and a games night on the 2nd and said they're fine staying on the sofas.

I asked my gf why she hadn't bothered asking me if I was okay with it first since it's not fair to invite guests over without both of us agreeing. She said she doesn't see the big deal and hasn't seen her friend in a while.

I pointed out her friend doesn't need to stay since she's already staying with family. I said I'll be up for going for a quick drink with them but that's it.

I said I don't want a games night and don't really want guests when I'm going to be drained and wanting to relax.

She said I was being unreasonable and said I should be fine with it since it's just one night but I just said no and said again tbat she should have discussed it with me before inviting them.

She said she doesn't want to cancel but I said she'll just have to say that plans have changed and they can't stay over but we'll still get a drink with them.

My gf just said again I was being unfair and should be fine with them staying.

How would you handle this?

Tl;dr I have taken time off after new year specifically to relax. My girlfriend invited her friend and her friends bf to stay over without discussing it with me and said I was unreasonable when I refused to let them stay ove