Northern Lights and our partners are sponsoring more than 20 calls for participation in the Northern Spark nuit blanche twin cities. Some are based on specific locations, some on specific media, and others are free form. The deadline for submitting proposals is March 7, 2011. Any artist – or in the case of some of the calls, curator or organization or business – may submit a proposal, but all projects must take place within one of the 6 Festival Zones. More information here.