I found this today and was really impressed by the initiative and idea. The Mattress Factory is offering a new level of membership, as I understand it, for Earth Day. It's a "Green Membership" level $30 and totally paperless. Email invites to all events, free admission and so on. I don't think it lasts long so sign up now!
The Mattress Factory is an incredible institution and this is a great idea. I say that as an artist, an environmentalist and a former arts administrator. I really hope more institutions follow suit.