I might be biased, but I am all about green promotional products. Since that is what I do, that is what I suggest.
There is obviously more to it than that. I believe in this type of promotion because I have seen the excitement they can create. We have several climate neutral products. The greener they are, the more people talk about them, the more people find out about your event and want to come!
If you are interested, you can email to discuss. That way I don't feel like I am posting a shameless plug here. :)

