I use to attend the amateur astronomy meeting on Friday nights at Duke. While as I liked astronomy, I was only a bit interested in viewing stars via a telescope on a cold winter night. I must confess that the real reason I would attend the meeting was that it was run by a physics professor who specialized in string theory. What a great occasion to discuss and learn about string theory from a world renown expert by crashing his telescope observation sessions.
Same thing with my hair stylist, I get my hair cut with her because we can talk about philosophy and Kant. Next thing you know, people will attend church with me to get help with their computer problems. Oh no, Mr. Bill, that already happened!