Lighting Suggestions for Dark Reception Hall - Example Pictures

We are getting a ton of rain in our area right now and because of a wedding gig I have that was supposed to be outside this beautiful hotel is being moved in the reception hall of this hotel. I went to the rehearsal tonight to get a feel for the room and take some test shots. Take a look at these and let me give me any suggestions for what I may do as far as lighting setup.

Here is my equipment:
2- 40D Bodies
Canon 70-200mm 2.8L
Canon 24-70mm 2.8L
Canon 10-22mm 3.5-5.6?
580ExII
480ExII
Flash Bracket
1 light stand
1 50"? Umbrella
Ton of flash gels
I am pretty sure that is it.

Any help would be greatly appreciated. And BTW... I start shooting at 1pm tomorrow. I am bummed that the wedding had to be moved because I was excited to have an outdoor wedding to shoot, but I am trying to give it my all to make it a good set.

The wide angle distortion is making me dizzy. Sorry.

it's got white ceilings...bouncing the flash shouldn't be a problem

Put a flash in each of the four corners pointed toward the joint of the ceiling wall. Use ISO 400 so that your not putting out to much distracting light.

Use the 24-70 at F2.8 and bounce the flash. I prefer full manual on the camera and flash because the lighting is not going to change. Gel the flash for the ambient indoor light so you don't have WB issues.

Use the 430EX opposite to your location on slave mode, 580EX as the master, both bounced, to help with the coverage.

Holy cow, you are tall!!