The Nats did a nice thing for 15,000 of their closest friends on Sunday afternoon. After soundly defeating the Phillies, 6-0, on a day perfectly suited to the game of baseball (75 degrees, cool breeze, sunshine), the team had a Picnic at the Park for season ticket holders. Now I have not purchased season tickets, but I was with a friend who did, and so I went along for the ride. This sort of mass…