Do I skip my S/Os birthday and go home?

My S/O has been writing a textbook. He’s been working nights/weekends to finish and is really stressed out.

His birthday is next weekend but he’ll probably be working all weekend including the holiday. We live a couple hour from our parents so won’t be going home like we usually do. My moms birthday is also adjacent to that weekend.

I talked to my mom yesterday who asked if we were coming home. I told her no. She’s going away Fri-Sun and wants to drive up here Thursday to get me and bring me home(I don’t currently have a car with me) so I can watch the family dogs. My brother will be home but is always out and my sister offered to watch them but my mom feels the dogs will be nervous being left at her house alone with their dog. She also is excited about spending a week with me and cleaning out my room. I saw her for like 4 hours on Mother’s Day but other than that haven’t seen her for a decent amount of time since Christmas.

Because I’m carless up here and know no one, when he’s working on the weekends I am bored. I do hobbies but it’s not enough.

His nephews birthday party is the weekend after that so I could stay until then and head back with my S/O.

I’m not thrilled about spending the holiday weekend alone by myself while he works. Do I bring up me going home? It means skipping his birthday which I feel bad about but he’ll probably work 95% of the day.

What would you do?