Story highlights Coffee lovers may have occasion to celebrate the beverage twice this week

The first official International Coffee Day is October 1, one coffee organization says

(CNN) Go ahead, have another cup of coffee. This week's mug runneth over with days devoted to the beverage that wakes up nations and keeps industries humming.

According to Internet sages and the arbiters of faux holidays, September 29 is Coffee Day (also known as National Coffee Day or International Coffee Day).

The origins of this day of caffeinated celebration are largely unknown, but who needs an origin story to justify that second, third or fourth cup?

Coffee purveyors are offering freebies to mark the occasion.

Dunkin' Donuts is giving away free medium hot or iced dark roast coffees on Tuesday.

Read More