Let's say I'm organizing a repeated event like a meetup or dance series: how should I let people know about it so they can decide whether they want to attend? You can break the world down into three groups:

  1. People who wouldn't be interested, even after fully learning about the event. Perhaps they don't enjoy the activity, have full schedules, or live too far away.

  2. People who would be interested, but don't know about your events. Perhaps they didn't realize there were in-person gatherings for this kind of thing, or didn't know there was one in their city.

  3. People who already know about your events in general, but need reminders or notifications about specific instances. Perhaps your event doesn't have a consistent schedule, or someone only wants to attend when they like topic.

You don't want to reach the people in (1): getting your event in front of them just wastes their time and yours. If I went through the phone book and called everyone in my city to tell them about my event, since they're almost all in (1) I'd annoy a lot of people.

You do want to reach the people in (2), but it's hard. Many methods of reaching this group will also reach many people in (1), and so be spammy.

On the other hand, the people in (3) should be really easy to reach: they want your notifications and know they want them. In my social circles, the main tool people used to use was Facebook events: you would join a group, and then you would get notified for every event created in that group.

Unfortunately, in practice this resulted in a lot of event invitations being sent to people in (1). Someone might be only a little bit interested in the group's events. Or they used to be interested, but now they've moved on. Or they never even joined the group, but someone else added them because Facebook experimented with groups working that way for a while. Or it's a huge group mainly used for discussion and then someone creates an event which few people actually want to see. Through a combination of limits, both algorithmic (events may or may not be shown to people based on Facebook's predictions) and strict (you can only invite the subset of a group which you are individually Facebook friends with), this has become much less useful. Then add in the general migration away from Facebook and this is not a good way to reach people in (3).

So what do you do instead? I think announcements mailing lists are a good fit for this group. For example, if you are interested in notifications about events for the contra dance I help organize you could join any of:

Similarly, there's a boston-effective-altruists list where we post announcements for upcoming EA dinners.

We host these lists on Google Groups, and they're self-service. Additionally, we can put out a paper signup form in person, and then enter the email addresses manually afterwards.

I think this works pretty well: people can ask to receive announcements, and if they change their mind they can stop getting them at any point.

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I get an access error for boston-effective-altruists.

I agree with Mingyuan that Google hasn't put a lot of work into making the UI a good user experience in a long time, but agree generally that email lists are probably a good option. I do think organizers should still post on Facebook though?

I also get an error for boston-effective-altruists. "Content unavailable Click here to try again." Perhaps a box needs to be checked to make it publicly available?

Yup -- fixed! Sorry!

Sorry! The group privacy settings were wrong. Fixed now!

(It was set so that the group was only visible to people in the group, which wasn't intended)

I think Google Groups are indeed pretty good for this! In addition to the benefits you listed, another good thing is that everyone has an email address, which can't be said of basically any other service. One downside is that Google Groups can be a bit hard/confusing/intimidating to join, although that's something the group owner has control over.

I've also seen a lot of communities being organized on Discord recently, and pingable Discord roles are another fairly good way to deal with this — e.g. there'll be a @book-club role and a @social-meetup role. (I'm not really sure how the events feature works on Discord.)