It’s hard to outdo the Great Dupont Snowball Fight of 2010, but let’s give it a shot. This Sunday at 2 PM, Dupont Circle will be the site of a Citywide Water Balloon War. It’s the first event of its kind in the District, so grab some balloons (they’ll have some, but you’ll want to bring your own for maximum soakage) and head over to the circle for the snowball fight’s warmer, sunnier brother. And a word to those families planning a leisurely Sunday afternoon in Dupont Circle? Prepare to get wet.