From our friends at DemRulz:

On December 21, 2018, the DNC issued 2020 Democratic National Convention documents, including the Call, Rules, and Regulations (see below).   These documents were drafted over 90 hours of public meetings by the Rules and Bylaws Committee (RBC) and its excellent staff.  The RBC carefully considered and implemented many of the recommendations of the Unity Reform Commission.  The next step in the process is for each of the 57 “states” to draft their own Delegate Selection Plans, which are to be offered for public comment by April 3, 2019 and submitted to the RBC by May 3, 2019.  The RBC must complete its work of approving or otherwise taking action on all plans by September 13, 2019.