There is a LUG and an Emacs group in a city 1 hr away from where I live. I've been on the LUG's mailing list for a while. I keep an eye out for blog posts from the Emacs meetup. I found out about these groups a long time ago.. not sure how. I used to work in that city.
You could watch the public library event calendar, or even create your own event at the public library and maybe start a new group with regular meetings. I hosted a Linux Installfest in a small town close to where I live. There wasn't a big enough turn out (only 2). Running the event in a bigger city would probably have been more successful.
I hosted an endof10.org event at my local public library. Advertised like crazy, posting flyers around town, posting online, etc. I had over 30 USB installers ready to go with Debian 13. I was worried that I was advertising too much and wouldn't have room for everyone.
Only 2 people showed up, and neither were prepared to go through with an install. In a town with well over 70k people and a major university, I expected more.
Now I'm thinking an event like this would only be viable in a major metropolitan area.
In my circle of friends and family, I only knew of one person who was faced with the Windows 10 dilemma, and he chose to purchase new hardware (granted he's nearly 80 years old).