April is National Poetry Writing Month in the United States where people are challenged to write a new poem every day of the month (see more about it here). You can also follow peoples efforts on twitter through the hashtag #NaPoWriMo.
I thought I might propose a different challenge for the month. Choose a landscape near you and write a short poem about that landscape. Then publish it in that landscape: paint it, write it on the concrete with chalk, write your poem on paper and stick it up somehow, record it and place an audio player in that area. Just get the poem into the place it is about so it may prompt others to think about the place/landscape in a different way.
So there you have it, a Guerrilla Poetry Challenge for National Poetry Writing Month