I attended the Convention as a delegate also. What a great time it was to get together with fellow Republicans! It sure looked like grass roots to me. I am very glad that we have the caucus system.
The funny thing about the process is that, while most people don't show up, when they had a chance to throw the system out a few years ago, they rejected the idea. You're right about the grassroots part. I always have a good time at these events, and, every now and then, you get to participate in a significant decision.