Indeed, unfortunetely spam is spam, regardless of whether the cause behind it is charitable or not...if we are to allow this spam we would have to allow the same leniency to the numerous other spam topics we recieve here on a daily basis
You can, however, actively participate in this and other forums and use your signature as advertising for a banner to link people to said site...the more you contribute to our forum, the more hits your "advertising" will get...and it's free