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I would suggest you need a shorter focal length prime, somewhere in the 35-60mm region with a nice large aperture of f/1.8 or so for low light shots.
You're also going to need a decent flash gun and, more importantly, you're going to need to know how to use it properly and subtly.
Don't bother with a tripod. I've shot a couple of weddings and never used one. It ties you down too much (IMO). You also won't need a remote release if you're shooting hand held.
A wideangle lens like the 10-20 might be useful. It really depends on how much lens changing you want to do. Most pro's have 2 bodies with a "normal" zoom on one and a longer zoom on the other as it's easier than changing lenses.
The only other thing to consider is upgrading your 18-55 to a better quality or slightly longer lens. I don't know the Canon range that well but you could consider the 17-55 f/2.8 IS which would be a regular wedding photographers general purpose lens. It's not cheap though (£800 ish)!
I've shot most of my wedding shots with either my 35mm f/1.8 or my 18-105. Once the main bits are over I sometimes switch to a 10-20 or 70-300 but not very often.
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