I am just with a camera club.  We don't get that much crowds and maybe with the internet the numbers have been decreasing.  

We suddenly had a session with portrait photography including studio lighting and a workshop (with models and make-up artists) that is to follow and we had people from other clubs and including some who do wedding photography for a living.  Also with the IRIS exhibition, they also get crowds when someone runs a session with a model and using studio lights.  I didn't know 80% of the people..  

The usual sessions never draw as many crowds.  A local pro that does wedding or aerial, landscapes, or pet or food photography or a police officer that does forensics, critique nights, quiz shows ... Or maybe someone that does a living and runs photo tours in various countries.  We even had someone talk about studio lighting without the workshop and it was just the club's own members.  We have also done practical weekends at the beach, the waterfront, the garden or a cemetery for a few hours and again just a good couple of people.  

:)