mhc 1.2.3-1 (amd64 binary) in ubuntu focal

 MHC (Message Harmonized Calendaring system) is a personal schedule
 management system, that is designed to help those who receive most
 appointments via email.
 .
 MHC has the following features:
  - You can easily import schedule articles from existing buffers.
  - Simple data structure; schedule articles are stored in the same form
    of MH that allows you to manipulate stored data in many ways.
  - Powerful but simple expression of appointments.
 .
 Non Elisp utilities are provided by the mhc-utils package.