Hi SS I can empathise. I too live very far way from home and my H has family here. To make it worse even though he never liked to do family things since meeting GF he's doing all sorts of stuff with his family and it used to really hurt me.
I don't want to sound mean but this is a 2x4: he's not responsible for your happiness he never was. It's not his job to make sure you have something to do st the holidays, just like it's not your job to make sure he's happy. If we put the power of our happiness in someone else's hands then we can't ever be sure it happens. So 4th of July s@cked.....so plan for labour day, Halloween, etc to do something! Now that you know holidays are hard prepare for them!
If I remember correctly, he spent this week on the boat with his kids right? And you don&5 get along with them or it was a sense of tension? When I am throwing a pity party for myself about being alone and cutoff I instead think about how I don't have his family's drama anymore! It's peaceful not lonely! Haha
He agreed to go away with you this weekend. If you bring this up, or let it overshadow the weekend (not enjoying yourself because you felt hurt, neglected, rejected etc) then there's a danger that he'll fear nothing he does is good enough
