orage 4.12.1-7 (armhf binary) in ubuntu focal

 This package contains a calendar for the Xfce4 desktop environment.
 It integrates itself nicely into the desktop environment, is highly
 configurable and supports alerts based on dates. If you are looking
 for a good graphical calendar, you will probably want to try out
 orage. It stores its data in iCal format.