Not many WW'ers from Greenville, but there are some riders and boats there, and a great stretch of water. You may have more luck asking around at the comp. Unless you are planning on skipping out from the comp a little early, not sure if you'll time for boat sets Saturday anyway, and most of the local riders will more than likely be at the comp.
I will be at the comp on Sat doing something; announcing, judging, driving, maybe even riding, but I am not pulling my boat up. I live in Wilson, a little less than an hour away, which is right where you get on US-264 from I-95 (depending on which way you are coming), and will gladly pull you on Sunday. You may have to come through here anyway.
If you are wanting to stay in Gville for the demo, then I can give you a few names/numbers of locals with boats that may be up to hosting something like this. Just let me know how I can help.