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\section{Science Themes}  The 20th Cambridge Workshop on Cool Stars, Stellar Systems and the Sun (Cool Stars 20) is plan planned  to take place in SUmmer of 2018, summer 2018.  This is the planned launch of JWST and a year that marks the start of our next expedition into the frontiers of astronomy. Between CS19 and CS20 we will also see a great move forward with the expected launched of TESS -- the first all sky planet finder and CHEOPS -- the first space mission intended to follow up and characterize super-Earths. Cool Stars 20 will serve as a perfect platform for refining the final details for proposals using these missions. More important than mission that will be new in two years, are the missions and facilities that are new now and will be at their peak in terms of vitality energy and new discoveries. These include ALMA, JVLA, Astro-H Sofia and Gaia.  
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\subsubsection{Bring the \textbf{sun} back into "Cool Stars, stellar systems and the sun"}  In recent years, the communities of cool stars and solar physics have more and more divirged, as the stellar astronomers have concentrated on the great zoo of exoplanets, while solar astronomers have increasingly detailed spectral, spatial and temporal resolution in their observations that has simply no comparison in stellar astrophysics. Given the strong solar research groups at the CfA, a workshop in Cambrdige is uniquely suited to set an agenda with a strong solar component, that will attract solar astronomers to be presenters and workshop participants. Despite the different fashions in both fields, the old guiding principle that we understand cool stars from looking at the solar example in detail, and that we understand the sun by comparing to a more complex sample with e.g. different ages (sun in time), masses, or abundances is true. Even people talking about potential Star-planet-interaction always come back to the solar example.  The last few CS workshops had invited solar talks, but very few participants from the solar community, thus there were no solar posters, no contributed solar talks and no discussion in the corridors with solar physics experts.  Thus, I advocate for a 1-day theme focussed entirely on the sun, strong enough in solar speakers and rooted in the CfA solar groups  to draw attendance from the solar community. community worldwide.  [suggested by Moritz]