Meetup : Arrow theorem, LW goals and plans, rational review

Note: most our members join meetups via other channels. Still, the correlation between "found out about Moscow meetups via lesswrong.com" and "is a great fit for our community" is very high. So we're posting just a short link to the hackpad document with the schedule here instead of the full translation of the announcement into English.

Pad with the details about 20.11.2016 meetup.

We're meeting at the "Kocherga" anticafe, as usual.