We first pre-create an account for each participant of your event.
Once participants register to your event, each of them will receive this email asking them to join the event platform.
When they click on the e-mail link, it redirects them to their pre-created account where they can edit their profile and go on the event home page.
It is not possible to synchronize the app to your LinkedIn account yet. As LinkedIn has been purchased by Microsoft, they changed the API that can't no longer get synchronized on Swapcard. However, participants can add their LinkedIn username in their profile on the app.