Ah, a nice straightforward piece. You don't bother dwindling around with imagery or anything, because you don't have to. It's all implied by those simple words, "When the Party is Over." It's particularly good how you don't tell the reader what the metaphor is, as is a hopelessly common mistake with many poets. You can use inference as a really powerful tool. Just keep it all up! I'd like to see more like this.