You know, it is really quite simple. If the leader of a class finds she is filling up to the room's designated capacity, she or a helper (and there are many) could address the group and tell them she is setting up a site to sign in on line. I know I appreciated it when Zentangle did it and I am sure many people would appreciate knowing before they got to the class whether they were going to get in.
I used to dance three times a week for exercise, now the stress of just getting into a class makes it uninviting for me. I am one of those who does not like to stand in line.
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A people free to choose will always choose peace. 
Law of Logical Argument: Anything is possible if you don't know what you are talking about!
Since light travels faster than sound, some people appear bright until you hear them speak
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