This will be the first Mokumoku-kai for Ember.js Tokyo. You're welcome to join us whether you've never used Ember.js before, or use it every day.
At a Mokumoku-kai, we'll get together as a group, and then individually work on on Ember.js related goals, sharing the result in the end. For example, you could read a book, write some code, set up a development environment, etc..
Mokumoku is a Japanese word which has several meanings, but in this case it means doing something concentrated and silently.
There's a slack team for Ember Japan community.