How does the ‘I’m interested’ button for events work?

You can find the registration settings under the 'Information' header on the overview page. The interest option is one of these. You can indicate whether you want to offer the option under 'I’m interested'. 

Users can then indicate their interest in an event during registration. They also have the option to add a note. Users can also undo any of this. 

The participants overview of the event shows the people that are interested, possibly with a note. You can perform a number of actions per interested person. From this overview, it is possible to send an email and you can send an invitation for the same event or another learning item.