Any eCard or email layout can easily be turned into an invitation or survey. Your email can also contain links to both an invitation and survey which is useful if you want people to RSVP and you have a specific detailed questionnaire you want them to complete before an event.
This tutorial covers how to insert an RSVP or survey response link into your email.
Important: You must have an event or a survey set up in your account before you can use this feature. Please refer to those tutorials for more details.