Rachel told me you were thinking of using mason jars as drinking glasses, why not make this your party favor, I know, queer, but this idea still works even if you don't do favors. Similar to the eyelets you're using on the invitiations, why not do a small tag with the person's name on it. That way it's not just a favor, it keeps track of your drink. These tags are available pre-made, whoo hoo, and not expensive. Little bit more ribbon and you're done.