Events: recording participant relationships

A question at CiviCRM StackExchange asks (edited for brevity):

I would need to create relationships between participants when registering for an event in the CiviCRM online registration form.

I have seen there is an CiviCRM extension [link to blog post from 2012] that promises to do that, but it seems it is not fully developed yet. …

Is there any CiviCRM extension that allows to create relationships between participants to an event?

And here's my answer:

The "Group Event Participant Registration" extension does create relationships among contacts in a multi-participant registration.

(I'm the author. The extension has been in production use for a couple of years by a client, but I've never bothered to promote it or list it in the CiviCRM Extensions Directory.)

The basic intent is to allow one person (who may not even be attending) to register others from their family or workplace for an event.

From the ReadMe:

• Allows registering user to indicate whether they will attend the event or not.

• Provides list of related contacts as optional pre-filled additional participants.

• Related contacts may be related directly to the registering user, or (optionally) through a mutually related organization.

• Records all additional participants as related to user, with relationship type selected by user.

… See beta demo video here: https://youtu.be/2zd3bENs0Ow

The StackExchange question has a few other answers you might want to check out as well. Here’s the link.

All the best,
A.