Letting people know about your event doesn't have to be big resource waster. Do you really need flyers, postcards, newsletters and print ads to tell everyone when and where to go? Instead, try sending invitations electronically or using social networking to get the word out. Using the Web also gives you an easy way to get RSVPs on the spot. Local radio and television is another great way to advertise that doesn't make the landfill grow.
If you must send out paper invitations or advertisements, consider using recycled paper and making the invitations or ads as small as possible to use the least amount of paper. Rather than having return cards for responses, tell people to phone in their RSVP or sign up for the event online.
And when you send out your ads or invites, don't forget to mention that your event has sustainability in mind (it's never too early to get people thinking about ways to be kind to the environment).