In only the second use of Mosaic on Plone.org, I added a content listing tile on https://plone.org/wpd so that visitors can immediately see the local events (which are in a subfolder)... 
Mosaic ftw!
(The first use of Mosaic on Plone.org is for the https://plone.org/gsoc)
We are planing to make a WPD event in Tokyo, Japan at 26 April 2017. We will soon create the event on the web site.
From Bologna, Italy - I need a few more days for the details, I'm going to put a preemptive entry right now.
Don't forget - even placeholder events with minimal info (just dates and location) are worth it!
We already have a couple of registrations for WPD in Munich from all over Germany. Keep in mind that if you will not promote your WPD people will have a hard time finding it and will come to Munich instead 