Just thinking it through, what would you expect the link to do?
I guess a pre-generated link would take the user to registration; once registered, they would be automatically joined to the group; and then they could either be taken automatically to the group page, or land on the dashboard as per normal registration.
The manual process for this if you want to explain it to people in the meantime would be:
- optionally visit Restarters and learn a bit about what the system does
- visit Restarters and create an account
- visit the group page (e.g. Hackney Fixers at Restarters)
- click Join Group
As a host of the group you should receive an email letting you know a user has joined your group.