Link topics after they have already been closed

[codinghorror (Jeff Atwood)]

Yes this is already built in, and has been since 2013. Let me illustrate by linking another topic here.

When personal messages are disabled, can users still message a group?

We’ve disabled personal messages because we don’t want users to be able to message each other individually. However, I think it could be valuable to make mentioning and messaging groups to still be available. For example, let’s say we create a group for all attendees of a particular event. We’d want to be able to message each other before and during the event + notify everyone by default when a message is sent, but then the event ends and it’s no longer needed so having a private category seems …

All I did to create the above was paste in this link like so

https://meta.discourse.org/t/when-personal-messages-are-disabled-can-users-still-message-a-group/201167

Now watch what it looks like on the other side…

… see the bidirectional link at the bottom of the post? This works for any post in any Discourse topic.