claws-mail-vcalendar-plugin 3.13.2-1ubuntu1 (s390x binary) in ubuntu xenial

 The vCalendar plugin for Claws Mail provides vCalendar message
 handling (the meeting subset of the vCalendar format), displaying
 such mails in a nice format, letting you create and send meetings,
 and creating a virtual folder with the meetings you sent or received.
 .
 The functionality is similar to the one provided by Evolution for
 that mails.