Personally I prefer using the Mac app Alfred for things like that—basically a graphical one-shot terminal with autocompletion for a bunch of frequently-used stu

Personally I prefer using the Mac app Alfred for things like that—basically a graphical one-shot terminal with autocompletion for a bunch of frequently-used stuff, in the vein of Spotlight. I whipped me up a script in Lua just so the calendar is faster than a readymade one in Python. However, Alfred needs to be bent somewhat to output content like a calendar in its suggestions.