I know this, the parking lot across the street with whatever that building is used for business gatherings... it was used by the Harris County Health Department for our R&R work day. That's a LOT of employees! And that parking lot was just one parking lot filled for the CL Park TEA Party. IMHO, 2000 is a conservative estimate. Plus, cars were honking non-stop the whole time. There were TEA parties all around the Houston area, not just downtown Houston or Houston proper.
Clear Lake, Texas Tea Party Tax Protest Rally Photos
http://www.freerepublic.com/focus/f-news/2231293/posts
If you have a link to your photos, ping me to it.