I believe that, with the right stimulus and support, every child can write good poems. Here are some of my favourite workshop ideas.
So, with all the free resources on this site, why would you need a poet to visit your school? How about: experience, expertise, inspiration, enthusiasm, performance, entertainment, the ability to create on demand... fun!
I've been inventing, 'borrowing' and modifying creative writing ideas for years. I'm always looking out for something that guarantees success, a formula if you like. But, a formula is only the start, the hook to show children what's possible. Once reluctant writers get the taste of success, we need to encourage them to adapt and modify... to make the idea their own, and to create new ones.