Ah, Summerslam. Sure, it’s not one of the WWE’s marquee properties, but we’ve always found it to offer a surprising amount of bang for the buck. And this year, August’s annual dose of “sports entertainment” (sorry persnickety DCist readers, we don’t have an “Entertainment” category so “Sports” will have to do) holds even more interest for D.C. residents than normal. Not only will the event be taking place at MCI Center, but Washington’s own Batista…