I love it when people make advocacy fun. I just read in Associations Now magazine about a game on the National Christmas Tree Association site (yes, there really is a National Christmas Tree Association, Viriginia).
The association worked with a game developer to create a computer game that both entertains and informs. To play, just go to the site and click on the "Games" section. You may need to download a "plug in." Basically, your role in the game is to throw snowballs at all the fake trees that pop-up -- fake trees that are destroying the spirit of Christmas!
As you progress through the game, you'll learn some fascinating things I'll bet you never knew about Christmas Trees -- like they're grown in all 50 states. Really! All 50. That means every member of the U.S. Senate and a whole bunch of members of the U.S. House have christmas tree growers in their district. See, I wouldn't have known that if I hadn't played the game!