The Canon 24-70mm F/2.8L is one of the most popular lenses for event photographers. It's also one of my favorite lenses for video since it can focus fairly close. Good range of zoom, and maintains a decent F/2.8 aperture throughout for low light shooting. I heard there was a sale going on over at B&H, but doing a basic search for the Canon 24-70mm F/2.8L only comes back with only a $100 dollar discount. I was able to track down the other URL where it shows a $200 dollar instant savings discount off normal price. That's a better deal than what they are offering on the Canon Rebates webpage (here), and cheaper than a used one on eBay, but says it expires in a few days. Here's the link (click here).
Canon 24-70mm F/2.8L Discount