To circle back on the solution for anyone else, you block out the content with the following:
[preview]
Here is preview text that is be visible prior to RSVP'ing
[/preview]
[hidden]
This section is not visible until the user RSVP's going
[/hidden]
I mistakenly thought it meant:
[wrap="preview"]
[/wrap]
[wrap="hidden"]
[/wrap]