I think that poetry is an act of celebration, that anytime you're writing a poem, it means that you're celebrating something, even if it's a sad poem, if it's an angry poem, a political poem or anything at all. The fact that you're taking the time and energy to pick up this thing and hold it to the light, and say, "Let's take some time to consider this," means that you've deemed it worthy enough to spend time on - which, in my opinion, is celebrating.