A well-placed flyer can reach the eyes of thousands of people per day, regardless of which social media platform they use, if any.
If you make a flyer for an event, share the file online and encourage others to print them out too.
Before sharing, remove the metadata with Scrambled Exif on Android or Metadata Anonymisation Toolkit on Linux. Sending a copy to a friend? Send it over Signal.
I hope it works out! Laser etchers are great for stencils (I use them a lot for spray paint). They work best when cutting thick cardstock or thin cardboard which happens to be a far superior stencil material to the thin paper I used to use when I had to cut them by hand. It basically makes a superior stencil while also being way easier and faster than cutting (and glueing) all the finicky little details.
I think the downside to the method you’re thinking of (assuming I understand it and you’re not talking about a mimeograph stencil) is that you’d have to design it around avoiding islands, as with single layer spray paint stencils. Not a deal breaker by any means, but also perhaps not quite as detailed as the mimeograph paper could do.
I really like the idea of mixing these old and new techs so I’d love to hear about any progress you make