We're making a donation to the horse rescue I volunteer at but also doing small favors (little chocolates on the tables). Thus, the donation is not the favor. I would like to put something on the tables just saying a little about the rescue and why it's important to us, without coming off as AWish. Maybe something like, "On our happiest day we're giving to a small charity with a massive heart: The Horse Rescue of Place Location. We think they do an amazing job rehabbing horses seized by animal control, and they rely 100% on volunteers and donations! If you want to learn more, visit their website....."
What do you think? Other ideas?