Install xcal by entering the following commands in the terminal:
sudo apt update sudo apt install xcal
Description:
a graphical calendar with memos and reminder alarms
The "classic" calendar app with memos and alarms, xcal normally sits idle and displays the date. When clicked on, pops up a `strip' for this month. Clicking on a day allows you to enter details. Automatically parses times entered, and reminds you 5 minutes before your appointment. . Supports daily and weekly repeating events and context-sensitive help.
Version: 4.1-19build1
Section: universe/misc