It is actually on December 4th where it's been said that Saint Barbara was killed by her father (decapitated). The reason behind this act is that her father (pagan) did not approve of her conversion to Christianity. After killing her by a while, he died by a sudden lightning.
I remember being told that Saint Barbara had disguised in order to escape her father and his desire of killing her. (I didn't research a lot, but there is mention of her escaping, but no mention of disguise. Nonetheless, in Lebanon, Saint Barbara is celebrated on the night of December 3 by kids actually disguising and going from door to door to get a treat.
Also, and this is dedicated to AM and COCO and to all Lebanese who are living abroad and used to celebrate this holiday, a lot of sweets are made and distributed for this occasion.
Like Atayef, either with Ashta or walnuts (which I prefer):
Of course, the best sweets (and they are VERY sweet) are the Ouwaymet (no clue what is their name in English)
And Wheat Grains, which are boiled and then mixed with sugar when presented. Very delicious.
Below you can see here, a Patisserie, making the Atayef, it has become a kind of tradition to this outdoors.
And finally, my disguise, socks with an evil witch on them!