01 Really want to go, and really want to stay home and rest
If a small invitation brings up two feelings at once, give each of them a bit of a hearing first, without rushing to decide which one is the real you. This page isn't deciding whether you go or stay — it just offers a way to sort things out: the two feelings might be answering different needs.
02 Write down what each one wants to protect
What you're looking forward to might be seeing friends; what you're hesitant about might be that the plan runs too long. Seen that way, the question isn't necessarily go-or-don't-go — it might be whether you can just go for the first half. Of course, some conditions can't be satisfied at the same time, and then you'll need to choose within what's actually possible, not paper over it with a line about having it both ways.
03 Ask for one condition that could be worked out
You could say: "I want to see you all, but I also need to get home early — is it okay if I just come for the first half?" Decide after you hear the answer, instead of demanding you feel zero hesitation first. This random page isn't treating the contradiction as proof of how much you care or how important this is — it's just giving your different needs names, so you can see today which ones you can hold together, and which ones need to wait their turn.