Yes, NAPOWRIMO is every April. There are official prompts should you choose to follow them, but the basic principle is just a matter of shooting for a poem a day for the month... I think should you want to see the official prompts for this past year (which I mostly didn't bother with
) they are still up on the blog... which would probably be an unapproved link at this point. But. Search for NAPOWRIMO and there's only one obvious result I think.