That is the point - while many of the bigger gatherings saw 1000-2000, many of the 800 or so “TEA Parties” were held in smaller towns with much smaller attendance. 50 at one that I know of, 200 at another, and so on.
And because this was a very loose-knit “event”, there really is no way of getting an accurate count nationwide.
I do know that the main event in Little Rock had about 2000 in attendance (at the peak), yet local media reporting “hundreds”.
There were 5,000 in some cities and apparently more than 10,000 in Atlanta