I've never been involved in rl mn activities so apologies if I'm talking about something already in place.
Have you ever considered a Mumsnet mela?
It's a type of fair, not just a meet up. So if one can imagine, there's a big hall or marquee, and, say, your regular advertisers set out stands. Plus any new ones that fancy getting involved. PLUS all of us who have an axe to grind, or a product to sell, or a charity to promote, or a public campaign etc etc etc could take a stall too. Don't you think it would be great? Tech could have a help desk , Tsarinas could have a corner and so on. There could be a small business corner -- I mean, just like mn but in 3D. And open to the public.
Is there any point to this? I think it would be great. I'd go.