Where's Facebook's Event RSVP Widget?

Facebook has a whole suite of widgets (and social plugins) that bring social functionality across the web, but one major feature that they are missing is an event RSVP widget. Event promoters around the world want a frictionless way of converting site visitors into event attendees, not just fans of their Facebook Page.

While we have not heard anything about Facebook releasing such a product, we think something like this would have immense value for any event promoter.