Great tactical ideas. That’s thinkin!
Another thing is to travel in groups with folks you know and coordinate with other known groups, who do the same. Group leaders count heads among the true tea-partiers and identify the “outliers.” (The folks who show up but no one knows.) Engage these folks in friendly conversation. (Hi! I’m ... Nice to meet you! And who are you? What brought you out? ) If they play ball, probably a good egg. If not, watch your six!