Mhm, your microformats are still off somehow Nathan (also having trouble with Parse-This recently but anyway), but no it’s very simple. RSPV is optional. All you gotta do is subscribe to the iCalendar Feed at https://events.indieweb.org/ics/events.ics and visit the events page ~15m before the meetup starts. Link will be available on the events page (or ask on the IRC).
You may login to the events page using IndieAuth, of course 🙂
My microformats are probably non-existent 😦.
I’m not really jiving with the amount of work required to add it to my current theme. Maybe one day…
I did (eventually) see the note about the link being available 15 minutes beforehand.
Well, you can always start a new theme with a decent foundation 🙂 Autonomie or SemPress theme come to mind. For me it’s part of the fun rolling my own blog.