The Festival of Lights in Lyon, France expresses gratitude toward Mary, mother of Jesus on December 8 of each year.<br />
This uniquely Lyonnaise tradition dictates that every house place candles along the outsides of all the windows to produce a spectacular effect throughout the streets. The festival, which includes other activities based on light, usually lasts 4 days, with the peak of activity occurring on the 8th. <br />
The two main focal points of activity are typically the Basilica of Fourvière which is lit up in different colours, and the Place des Terreaux, which hosts a different light show each year.<br />
More: http://maya-press.net/festival-of-lights-in-lyon-true-story/