When logged into your Billetto account, you can download your guest list at any time by clicking on "Calendar" at the top left of the page and then clicking on the ‘Manage' option next to the relevant event. This will take you to the Overview page. You can find the guest list option on the left hand side of the Overview page. You will need to open the XLS or CSV format of the file to see a guest list which includes the email addresses of all attendees.
You can also look up individual guests and their email addresses under Orders. Here you can also request a refund for guests’ tickets, resend tickets to guests or forward tickets if one of your guests has entered a wrong email address.