Gleaned from Facebook:

Hi all, Lilies Event Steward Mistress Rhianwen here!

Thanks very much to the 280+ people who have already filled out our Attendance Estimate survey! We have one additional request: Please share the survey with your local groups via email, social media, and in-person communication. Some folks aren’t on Facebook, and we want to get as much feedback as possible.
We are interested in feedback from people who think they are attending AND those who think they are not.

Here’s the direct link: https://arcg.is/1nXPCX

You can also access the survey at http://LiliesWar.org

Many thanks to the ever-wise Countess Ylva for pointing this out.

(P.S. Yes, as Master Andrixos and Master Alan have noted, this is really all about the portajohns.)