The form is the transaction; everything above it is the argument
A webinar takes payment in one currency only: a name and an email address. That makes the form the moment the whole invitation exists for, and it is why a form inside a document or a forwarded spreadsheet fails. Answers land in somebody's mailbox, there is no trustworthy count of who said yes, and nobody receives a way in. A form on a registration page fills a register, and that register drives everything after it.
The page around the boxes matters as much as the boxes. Above them sit the title, the date with its time zone labelled, the agenda chapters, the speaker and the number of places. By the time a guest reaches the fields, the decision has mostly been made; your job is not to interrupt it.