Taylor Swift is playing two shows at Lincoln Financial Field, this Friday and Saturday, and sponsor Comcast is setting the scene with a party on the Comcast Center plaza Thursday from 11:30 a.m. to 2 p.m., at the Comcast Center at 17th and JFK. Two of the singer’stour trucks will be parked at the plaza, so step aboard and snap as many selfies as you can. The event will also include music — the singer’s hits, we assume — and giveaways.