Double booked

em
So, I thought the 15th was a Friday night, but I've double booked myself for Saturday night and don't know what to do!! I booked them at the same time too, so it's not a matter of "go to the one you booked first!"
Here are my options:
1. A games night we do every few months with childhood friends. Except, my sister is home for the first time in 8 months, so we won't get another night like this with my sister for a long time, BUT I do get to do other things with her whilst she's here.
2. A barbecue my s/o organised with his mates. His family is camping for the Easter weekend, and this is the first time in a looooooong time we've had the weekend to ourselves. I asked his best friend's girlfriend to come so I had someone to talk to, but she won't have fun if I don't go, and I don't get to see her often.
What would you do? I'm so keen for both! Both end around 11pm.

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