I was there, as well. I mainly stayed near the corner of Charlotte and 6th (inside the plaza).
I spoke with some CCers from Florida, Kentucky, and Alabama. They asked me about OC and I told them that TN law did not diferentiate between open or concealed. They all seemed to like that idea. None decided to OC, that I could tell, but seemed to enjoy having the option.
I chatted briefly with three MNPD before they had to deal with a disrupter in the crowd. They definatly saw my G30 on my hip, but never asked me for my HCP.
With about 10,000 people in attendance, its not surprising that we missed each other.
Oh, I did get to shake hands with Rep.Blackburn and Lt. Gov. Ramsey.