Form submission receipt to be sent to user

I need help. I built a website for a four day festival that has multiple events going on at the same time. 

I created a form on squarespace for attendees to fill out which event they would like to attend during the designated times over the four days. Problem is their selections only are emailed to me. It would be ideal if a receipt of their form selections went to both myself and to them. 

Has anyone found a solution for this? I feel like recipient submission receipts are standard practice.