Daily Holidays - December 23
National Pfeffernuesse Day
Pfeffernüsse are tiny spice cookies, popular as a holiday treat in Germany, Denmark, and The Netherlands, as well as among Ethnic Mennonites in North America.[1][2][3][4] They are called pepernoten in Dutch (plural), päpanät in Plautdietsch, pfeffernuesse or peppernuts in English, and pebernødder in Danish. http://en.wikipedia.org/wiki/Pfeffernüsse
Festivus
Welcome! "Happy Festivus" is the traditional greeting of Festivus a holiday featured in "The Strike" episode of Seinfeld. The episode first aired on December 18, 1997. Since then many people have been inspired by this zany, offbeat Seinfeld holiday and they now celebrate Festivus as any other holiday.
According to the Seinfeld model, Festivus is celebrated each year on December 23rd. However many people celebrate it other times in December and even at other times throughout the year. http://festivusweb.com
Human Light Celebration
HumanLight is a secular holiday on December 23rd. It’s designed to celebrate and express the positive, secular, human values of reason, compassion, humanity and hope. HumanLight illuminates a positive, secular vision of a happy, just and peaceful future for our world, a future which people can build by working together, drawing on the best of our human capacities.
The 23rd was chosen so that it would not conflict with other existing holidays, but would still be in the thick of the holiday season, when many gatherings of friends and family occur and people might be off from work. We've always said that it can be celebrated "on or around" December 23, in order to avoid any rigid rules about dates. http://americanhumanist.org/HNN/details/2012-12-how-to-celebrate-humanlight-a-december-holiday-for-h
http://www.famousbirthdays.com/december23.html
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I'd never heard of the Human Light Celebration, so I'm glad you posted that. 
Not to say that often these threads go off onto different tangents, as they do. That however, is the fun of them and why I personally enjoy them. I am usually unable to get back to them after posting as I am off to work, with limited internet access, so any gap in my additions or responses are of necessity and not due to lack of interest in the follow up posts.
I hope that your birthday was enjoyable and that you will continue to participate in the Daily Holiday Threads. They just like the rather odd-ball holidays they include are about taking a moment from our too often, too serious world and just heading out in another direction, even if it is very briefly.
As the wise man once told me.... "Life is too important to be taken seriously". 