Ipywidgets dev sprint

The ipywidgets contributors are planning an intensive dev sprint for ipywidgets, focused on ipywidgets 8 and beyond, in Paris, Jan 6-10, 2020. Sylvain Corlay will be hosting us in Paris.

Planning for the sprint is at https://github.com/jupyter-widgets/ipywidgets/issues/2587 and https://github.com/jupyter-widgets/ipywidgets/issues/2641

If anyone would like to come, or knows someone who would like to come, please let Sylvain or myself know, and please feel free to point them to the above issues.