You are hereby invited to participate in the second workflow workshop and hackathon to be held March 10-13, 2020 in Livermore, CA. This event is intended to bring together people in the larger High Performance Computing community who are developing and using workflow technology for simulations, experiment analysis, and convergent workflows leveraging machine learning and data analytics. Days 1 and 2 will be a workshop followed by a 2-day workflow hackathon, where practitioners will have the opportunity to do hands-on work with the various tools/capabilities presented at the workshop.