Events: define a user journey from attendee to community member

A great way to increase a community size is to create public events and invite them to join your community in the process. It would be quite valuable to define a way to get that to work.
A few ways I could see that happening:

• include a path from the feedback flow to get those people converted
• add the possibility to send a specific email just for that to non member attendees
• add the possibility to send custom emails to event attendees