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"I mean he is the nominee right? I know he probably wants to make a grand entrance, but in the interest of party unity, I think it would have made sense for him to be there. He's campaigning in Montana when all of the action is in Denver, I don't get it."
You must have never seen another convention. This is what always happens. The nominee only appears when he is nominated. This is very standard stuff. After all, controlling access is important to image, and image is important.
He will show up when he is needed. Others need a moment in the sun too.