The map is built in Meteor, here’s the current live version: http://gather.focallocal.org
(we also use the same code for our positive action gatherings so currently the wording is geared up for those)
The aim is for a Beta launch before the Hack, so we can test, review and update what needs to be improved on the day. We will begin that now, here 
We have a Slack Team who will gradually be moving across here. If you’d like to get involved in the build before the hack day send me an email and i’ll add you
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Here’s the Github
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Roadmap, which does need improving
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and you can see more in the Action Center