Appears that Nuit Blanche happened once in 2009 in Victoria BC https://www.facebook.com/events/10153078812276387/
I.E.: For one sleepless night, experience Toronto transformed by artists.
The familiar is discarded as the city becomes the artistic playground for a series of exhilarating contemporary art experiences.
One night only. All night long. All free.
Experience the magic of Scotiabank Nuit Blanche once again on Saturday, October 1, 2016.
(sample installation https://www.facebook.com/jim.harris.profile/videos/vb.622235708/10154350548205709/)
Culture night (in lieu of or complementing Nuit Blanche) seems to have a much more broad mandate. I went in Ireland and museums/tourist spots were open late and free for one night:
“Enjoy a late night of free cultural events in towns and cities across the island of Ireland on Culture Night, Friday
Arts and cultural organisations open their doors until late with hundreds of free events, tours, talks and performances for you, your family and friends to enjoy.” http://www.culturenight.ie/