I realize this as a potential problem.. but then again, who would look for random events and rsvp to them... besides the slew of Techcrunch commenters that spammed the event mentioned in the TC article with javascript hacks :) (which are now being detected and disabled)

Bot spam is a different creature, and I have some measures to prevent against it, with more coming soon.

I wonder if there's a way to not let Google index it? Something about the robots file maybe?