If I remember correctly, when I signed up to VMG there was at least one check-box saying "do you wish to be contacted by VMG and its partners." That box, or similar could be added to donors, asking them "do they wish to be contactable by email by event organisers."
Despite the existence of that question VMG could write automatically on behalf of an organiser, saying "the event organiser wishes to contact you, here is their email address. Contact them if you wish to progress this."
Either or both of these methods should solve the problem while correctly addressing data privacy issues with minimal effort.
This message was edited 1 time. Last update was at 01/02/2012 19:40:57