Advice please

Someone please tell me if I’m being unreasonable. My boyfriend called his dad on Friday and asked him if he wanted to get together on Saturday night and have dinner. Well earlier today (still Saturday) his dad called him and said that we are more then welcomed to come over but he’s busy doing yard work so we would just end up sitting around not really doing anything. Well we went to the store earlier and got some food to cook out. Someone in the household already started making corned beef in the crock pot so I ended up making Mac and cheese for myself since I’m not a fan of that food. So we have the cookout food and postponed doing it until tomorrow. His dads gf texted him like an hour ago and said we should come over tomorrow and go to her sons game and cook out. Well we already made plans for tomorrow and I don’t want to attend now. We already made the plans and got the food to do this. So since I don’t want to go I decided I’m going to go to my moms and get more things for the baby since we was supposed to wash all the babies clothes and get things more prepared to welcome baby home. Now he’s demanding that I go. I said he can go but I don’t want to go when it’s more convenient for other people when I can be doing the things I need to do, and the fact we already made plans for tomorrow. I don’t know how to compromise in this situation. On top of all this his boss had invited him out to a fishing trip that he didn’t go on because we was supposed to be getting and doing all this stuff for the baby which really hasn’t been done. I’m not one of them submissive people that just does what someone wants me to do. I fully believe in the fact we are our own people and have free will. Can someone please give me advice on how to compromise in this situation.

Shit, he asks way to much tbh. It’s never about what I need to get done or what time I spend with my family. I don’t think he needs to demand me to do anything. And ultimately it’s not about what I want, it’s about what we NEED to get done before our child is born here in a few short weeks. It’s just annoying because not only did they last minute say they was doing yard work also said their house was a disaster so they didn’t want us to see it and mainly it was his girlfriend who said these things, not his dad. So I guess she felt bad later in the day and invited him for tomorrow? I’m not really sure how she felt. However we barely got anything done today far as everything on our list but I would like to finish it. Next weekend I am going out of town with my own family, so I just figure he can do what makes him happy then. I don’t get much time to spend with my family, plus they are giving me a mini baby shower. Idk, I think things could be better planned out considering I’m trying to get things done. Otherwise if I wasn’t so busy up until the baby arrives I wouldn’t have had an issue changing my plans around to accommodate other people.