Google wedding app helps you simplify planning weddings. Google Wedding application is an amalgamation of its existing applications like google sites,docs and picasa plus a photo editing app picnik. According to google blog the creative designs were created in collaboration with renowned wedding planner and destination expert Michelle Rago.
I wonder why Google did not choose to make an all event planning application. Well certainly it has all the supporting applications already built for that, its only a matter of creating a nice GUI.