Family Issues Support Group
Family issues is a huge range that go from minor conflict to major misbehaviour and even abuse on the part of individual members of the family occur. Whether you feel you are in a dysfunctional family or you're dealing with a very specific issue, this is the place to talk about it and find others who might be going through the same thing.

For me, my brother's deployment party would come first since the country is at war and could be the last time I was able to spend time with him. But, as I said prior, it all depends on how close the both of you are and past experiences with personality issues in the family.
Who cares what others think- it's your brother's fault. He has several weekends from which to choose, but it sounds like he did it on purpose. Does he expect you to leave your own house/party to cow tow to him?
And I'd not want to even send a 12 pack to contribute to a "drunk fest."
I think you already know how you feel and just need some permission to do it. You have my full support.
If you really feel bad, invite him over for a home cooked meal so you can spend some quality time with him instead. That's more meaningful than a beer binge anyway.
Any way to break up the day?...may special breakfast or event with hubby then a stop over at yopur brothers party in the evening?