Can the AI build the whole webinar page from one message?
It can draft most of the wording and lay the page out in the right sections. What stays with you: the join link, the time, the seat cap, the questions the form asks, and the final read before publishing.
Does it publish or distribute the invitation on its own?
Neither. Nothing is visible to guests until you publish, and sending is your job from your own email or chats. The drafting produces text; it does not put that text in front of anyone.
Will the draft invent a date or a link if I have not decided?
It should not, and the reliable habit is to say what is undecided in your own words. Gaps stay marked as gaps. If something reads as invented, that is the cue to stop and fix it before publishing.
Does drafting work the same on a webinar as on a party invitation?
On the prose sections, yes. A webinar page has fields a party page lacks: registration questions, a cap, chapters with durations, your own join link. Drafting helps with the sentences around those, not with the decisions themselves.
Can I use the drafting again after guests already have the link?
Yes. The address stays fixed while the page behind it keeps changing, so a reworded description or an extra chapter reaches everyone who opens the link next. Earlier registrants still have their own confirmation.