If you like Calendar, you might like Fortune. It's usually in the "bsdgames" package (https://www.polyomino.org.uk/computer/software/bsd-games/). You can add it to your bashrc file to see a new fortune each time you open your shell.
~$ fortune
Overload -- core meltdown sequence initiated.
~$ fortune
Politicians are the same all over. They promise to build a bridge even
where there is no river.
-- Nikita Khrushchev
~$ fortune
Distress, n.:
A disease incurred by exposure to the prosperity of a friend.
-- Ambrose Bierce, "The Devil's Dictionary"
~$ fortune
The Preacher, the Politician, the Teacher,
Were each of them once a kiddie.
A child, indeed, is a wonderful creature.
Do I want one? God Forbiddie!
-- Ogden Nash
Or try http://github.com/globalcitizen/taoup for a more unix/software design focused fortune database in an implementation that supports color. Interoperable if you are an efficiency die-hard with a color blindness problem.
I think the coolest part of this was looking at the shell script for /usr/bin/calendar. It's personally gratifying to know that even the UNIX guys wrote scripts that shellcheck.net would crap all over:
The most appropriate sections seem to be Events and Holidays and Observances. There are also links to parallel daily databases by the BBC and New York Times.
It comes in the base of OpenBSD, and I use it in lieu of a calDAV server. Being able to quickly jot down an appointment and recall it on the command line is hecka useful.
Why anyone would bother using UNIX or its inferior clones (eg. Windows NT) in 2018 is beyond me.
The year of the Linux desktop already has been and gone, back in 2001.
We are spoiled for choice with a variety of free, modern, microkernel based desktop OS's written in safe languages, such as Rust, Golang, Haskell and Java. Why people persist with this monolithic, unsafe, ancient artifact of the early days of computing is anyone's guess.