Yes, I will be attending IndieWebCamp 2019

Here's how to do an RSVP in HTML.

<div class="h-entry">
  <span class="p-rsvp">Yes</span>, I will be 
  attending 
  <a href="https://2019.indieweb.org/summit" class="u-in-reply-to">
    IndieWebCamp 2019
  </a>
</div>

impressions:

• h-entry needs a p-author inside and not in context of the website?
• no docs: only p-author reference according to google is the h-event page
• why h-things p-things and u-things?