A participant can deregister himself by returning to his registration form. You can also do this for the participant, being the organisor. To deregister a participant:
By deregistering the participant you do not request a refund. When a participant is entitled to a reimbursement, you request a refund. How to this, is written in this article.
eventilo.com has a lot of features to organise events. That is why we made a manual. Ideal if you are busy organising your first event on eventilo.com.