How to run one
Six to twelve people you already know, in a room, for about two hours. This is what hosts say they wish someone had told them before their first one.

Six to twelve people you already know, in your lounge room, for about two hours. You don't have to know much about the subject. Someone else comes and does that part. Your job is getting people through the door, and that's the part nobody else can do for you.
Why bother
Almost nobody has ever been asked about this by someone they actually know. They've had leaflets, and a stranger at the door on a Saturday, and a lot of arguing online. Sitting in a room with people they trust is a completely different experience and they tend to say so afterwards.
The advantage you have is that everyone there likes you. It's why they came, it's why they'll stay for the awkward bit, and it's why they'll say yes at the end.
Two or three weeks out
Pick the date first. Everything else is easier once there's a date, and until there is one you're asking people about an idea. Two or three weeks is about right. Any less and you spend the whole time chasing; much more and people forget they said yes.
Write your list before you ask anyone. Family, work, whoever you play sport with, school pickup, the group chat, the neighbour you actually talk to. Put down more names than you have chairs — roughly half the people who say yes will be there on the night, and that's normal, not a sign you did it badly.
Then ring them. Ring, or ask face to face. Not a group message and not an event page. This sounds like a small thing and it isn't — a personal ask is basically the whole method, and everything that feels more efficient works worse.
Say why you care, in a sentence or two, in your own words. Say what it is and how long it goes. Say the date. Then stop talking. People need a second to answer and most of us fill that gap by talking them out of it.
“I've been getting pretty worried about this and I've decided to actually do something instead of just stewing on it. I'm having a few people over on the 14th — someone's coming to talk about it and we'll work out what we can do. Couple of hours. I'd really like you to be there.”
Remind them twice. A message two days before, and one on the morning. It feels like nagging and it is the difference between eight people and three.
Setting up

Get the chairs into something like a circle, even a bad one. If half the room is looking at the back of someone's head, half the room won't talk.
Tea and something to eat. It genuinely does not need to be a spread and people relax more if it isn't.
Ask everyone to put their phones face down at the start. Nobody minds if you just say it.
It doesn't have to be a house. Lunchrooms work, so do halls, quiet cafés and video calls. What matters is that the people in the room know each other.
How the two hours go
The facilitator runs it, so you're not watching the clock. Roughly:
- Round the room. Name, and one line on why they came. Do this in the first ten minutes. Anyone who hasn't spoken by halfway through usually doesn't speak at all.
- You talk for two minutes about why you asked them. Not facts. What happened that made you care.
- Twenty minutes or so from the facilitator on the actual subject.
- Then the long bit, which is people talking. This is the point of the evening. Let it run.
- What we could do about it. Local, and soon.
- The ask.
Asking

Do it out loud, in the room, before anyone stands up and starts finding their coat. Once people are standing it's over.
Make it specific and put a date on it:
- Host one of these yourself. Ask for this one first. It's how any of this grows.
- Come to the thing on the 3rd.
- Sign it now, on your phone, while we're all here.
- An hour a month.
Don't let yourself skip it because the evening went well. An evening where everyone agreed with each other and went home is the most common way one of these is wasted, and people can usually tell.
Write down who said yes to what, on the night, not from memory the next morning. You can put it into your own page here and nobody sees it except you and your organiser.
The week after
- Message everyone within a couple of days and say what happens next.
- Go back to the people who said yes. A yes in a warm room needs one follow-up to survive a Tuesday.
- Don't write off the ones who couldn't come. They were interested enough to be asked, and some of them will host the next one.
Things that go wrong
Only three people turn up. Run it anyway. Three people who trust you is a real conversation and the evening is often better than the full ones.
Someone disagrees. Good. That's the one thing you can't do with a leaflet. Let them say it properly and let the room answer — don't jump in and win it on their behalf.
One person talks and talks. “That's really useful — I want to hear from someone who hasn't had a go yet.” Say it kindly and move your eyes to someone else.
The room goes quiet. Ask the quietest person a direct question about their own life. Not an opinion question.
Nobody will commit to anything. Ask for something smaller. A small yes is worth more than a big maybe.
Where this comes from
This is the short version of two much fuller things, both worth reading properly:
Photographs, in order: Matthew Henry, Helena Lopes and Brodie Vissers. All three are CC0 — free to use for anything, no permission needed — via Unsplash and StockSnap.