I live in Toronto, and I've worked on conventions here (I worked on Toronto Trek/Polaris for several years), but as far as I know I don't know anyone who's actually been on the sets. I've known Robyn Stewart, the show's Klingon translator, for nearly 30 years - we met in a theatre company at university - but even she's never been on the sets. She did her work remotely, from Vancouver, and they hired a local dialogue coach.