I spent the better part of a whole day tramping around this encampment (out by Yarmag, on the way to the airport) with a friend, looking for a horse owner he know. We had no luck. But we had lots of airag. People tend to be very friendly during Naadam.
The encampment was composed of various people who had come in from the countryside to race their horses. People tended to group together depending on the aimag and even sum (roughly a county) that they were from.
That's Ulaanbaatar in the background. We were south-west of the main part of the city, looking more or less northwards when the photo was taken.