He started this event stating that this is where Washington planned the attack on the English. Potomac! Symbolic!!
Perhaps the size of this event is limited because of the venue. It is at a historic farm in PA. They might not be able to handle a large crowd. This farm was chosen because of the historic significance of the place. He does sound like his voice is failing a bit. He is going to have to be careful not to blow it out before he finishes events/rallies on Monday night.
If this is in Bucks County, PA, he may be in Washington’s Crossing.