I completely agree with above concerns - specially me being hygienic freak.
But then I seemed to answered my own question.
There is a reason why ratio of providers to hobbyist is 2:1.
so that providers who are not participating for that hour can freshen up in meantime.
And for people who has SO - I don't understand it lol. My work needs me to travel - you can just make something work related and come back next day.
Thanks for good response guys. If anyone plan something like this in dallas - please don't forget to invite me