The prospect of anything may induce excitement-- but it is not because of the place or the party itself that you become excited. It is because of the memories of the past, the hopes for the future, the people who will be there. And contrarily, the memories, the people, and our attitude can make it something we dread. It is not the event itself that creates the atmosphere, but what we bring to it.
Atmosphere is not substantial. The music, the decorations, the people; they do not create an atmosphere. Instead, it is our own reactions to those things, those triggers, that create it. Our feelings about them, our memories tied to them, our attitude towards them inspire the atmosphere.
Consider what atmosphere you are creating.