YTA.

I'm not upset about not being in the wedding party

You're sure not acting like it. And frankly, the way you've managed to make this all about you because you can't figure out how to keep yourself entertained at a party for the few periods where your partner won't be able to just walk over and socialize anyway is probably the exact kind of drama they were hoping to avoid by not giving you a major role in the first place. Take several steps way back, really examine your behavior here (and throughout the rest of the friendship, if you're still trying to figure out why you might have been excluded), and decide whether you want to be there for your friends or not...but don't force your partner to take an unnecessary stand because you're not as high up the priority list as you thought you were.