If you wish the couple well, but have limited interest in following proceedings on the day itself, here's something you might consider. I received a press release which is not really suitable for the publications I write for. So I'm putting an abridged version here:
Save The Frogs Day Events Planned Worldwide April 29th
Prince’s wedding coincides with the world’s largest day of amphibian conservation
Santa Cruz, California, April 3, 2011 – Was Prince William a frog in a past life? Quite possibly, since he chose his wedding to take place on the 3rd Annual Save The Frogs Day, a worldwide celebration of amphibians also scheduled for April 29th. Frog lovers and environmentalists of all ages are gearing up for what is expected to be the largest day of amphibian education and conservation action in the planet’s history.
The goal of Save The Frogs Day is to raise awareness of the rapid disappearance of frog species worldwide. Events are being planned in at least 15 countries, including the United Kingdom, United States, Canada, South Africa, and Australia. The events are being coordinated by SAVE THE FROGS!, a California-based nonprofit dedicated to amphibian conservation.
More info at Save The Frogs Day. Their site also has lots of cool pictures of frogs, including this one: