Turn your flash off inside the church so you do not
interrupt the wedding.
Take lots of close up groups it makes a valuable
record.
Don't forget to take some detail shots like the
cake - Before it's chopped up!
Set your camera to Hi ISO mode with flash off and
you can get some great photos of the overall scene.
A class reunion - get as close to the group as you
can - It's the faces you want not the background.
Spontenaity! - Wait for the moment then shoot..