🚀 go-pugleaf

There was a widely reported march in Washington today (Saturday)
having to do with problems of cities, with some mayors in
attendance, including the Mayor of New York. 

I was there, and I estimated the rally on the grounds of the
Washington Monument to have a crowd of about 11,000, certainly
no more than 15,000. Almost all who were there marched in along
Constitution Avenue. 

To estimate the stationary rally crowd on the Monument grounds.
I used a map to determine the areas having densities of 1, 5, 10
and 20 people per 100 square feet. To estimate the size of the
march, I could be more direct: I counted the marchers as they
went by, by visually breaking the crowd into chunks of about 25
and tallying those units. I was pleased that my two estimates
agreed with each other. 

I imagine the Park Service will be quoted by the newspapers
tomorrow as saying that there were between 50,000 and 100,000
people there. Or they might just say "tens of thousands"...