If Mt. Spokane is right and it's the battery, you could always find a local store and buy a battery. This would give you the ability find out if it really is the battery and, since you were wanting to shoot this weekend, you could enjoy the camera then deal with Amazon on Tuesday. You'll want a 2nd battery anyway, so that would not be a waste of money.
That's what I would do.
Zip over to the nearest Best Buy and pick up a second battery. Unfortunately, they won't have Canon brand, but since it's only your spare and this is an emergency, it's okay. Put the battery in the camera immediately, without trying to charge it. Usually they have a little juice in them to begin with. Should be enough to power the camera up.
If it doesn't, then stick it in the charger for about an hour. You should be able to tell from the indicators on the charger after an hour if the battery is charging (You should get two or three fast blinks, a little pause and then two or three more. Or, if fully charged a solid green.)
If the indicators aren't showing any progress, it's probably your charger that is bad. If they are showing some progress, then take the battery out and put it in the camera again. An hour of charging should be plenty to give it enough juice to power the camera on. If it doesn't power on, it's probably the camera.
If it does, then use the battery check on the camera to see how much juice is in the battery. If it shows 50% or more, go ahead and use it like that, until the battery drops to like 10-20% or so and then charge it up fully.
You'll then know that you have a bad battery and, as Brett says, you can deal with it on Tuesday. I would think they would just send you a replacement battery. At least that's what I would expect of Adorama or B&H. I don't know about Amazon. I avoid them whenever I can.