Organizing a Conference/Sprint/Workshop

We may want to organize an in-person Dask meeting that brings together core developers and sophisticated users. This came up in this month's community meeting and there was general enthusiasm for the idea.

See meeting notes here: https://docs.google.com/document/d/1UqNAP87a56ERH_xkQsS5Q_0PKYybd5Lj2WANy_hRzI0/edit?usp=sharing

Some thoughts from that meeting:

- For our first event this might be somewhat small, maybe 20-40 people.
- It might be something in between a sprint (usually 90% devs 10% users) and a conference (90% users 10% devs)
- After checking in with some people a few of us (@jcrist @mmccarty @kkraus14, @mrocklin) might meet up and discuss logistics