don't forget about backgrounds
Basic Event Coverage
Things to keep in mind (there's a lot more to event photography, but here a few of the highlights).
Be unobtrusive as a possible. Get your shots, but do not be in the way if you can help it.
Good coverage vs making each shot count. Do not hose, but at the same time, do not just shoot one and call it done. You should make sure you get your shot (both from a technical aspect and from a creative one) but you do not need 30 of the same shot if you have one in the bag. That being said, make sure you do have it in the bag.
Change up your angle. I know they cover this is the articles I proved with this post, but make sure you’re thinking about getting shots from both high and low angles. Straight-on is fine for a lot of work, but make sure you’re mixing it up.
Do mix it up. Get good coverage, but make sure you’re moving around, photographing different subjects, and trying to make good images.
Get your settings right. Don’t shoot too slow and wind up with a bunch of blurry images. Use an appropriate aperture setting (typically this will be pretty wide, but if you’re trying to show a large area or group, you may need to stop it down. Otherwise, a wide aperture will help you isolate your subject from your background).
Get your white balance right (and consistent). If you shoot your event on Auto WB, you’ll be color-correcting a ton of shots. If you work to get your WB as correct as possible in-camera and leave it there, you can correct one then copy and paste that correction across all your images form that shoot in LR.
Shoot with the lowest ISO possible, but don’t be scared to raise it if you have too. You know what’s bad? Noisy images. You know what’s unacceptable? Blurry images. Think about what you’re shooting? Are people moving around? Then you probably need a faster SS and a higher ISO (if it’s indoors/dark/etc.). Are people not moving around much? Then slow your shutter down a little to try to eke out a lower ISO and get better image quality. It all depends on the situation though.
Isolate your subject. Through composition and settings, try to simply your compositions as much as possible. Busy photos typically look amateurish. Well-composed shots that remove extraneous elements look professional. We always want our shots to look as pro as possible. Always.
Respect the client/attendees/etc. You’re there to take pictures, but the event is not for you. In fact, if you are the center of attention, you’re doing it wrong. People typically try to not get in your shots, and usually they kind of freeze up/act awkward when looking down the barrel of a lens. Do your best to let them know that you’re there for them, and not to worry about doing anything special for you; you’ll work around them. If someone clearly isn’t pleased with you shooting them, then you should look for a new subject if it all possible. Shooting a clearly uncomfortable subject is probably not going to lead to any good shots.