This was great news: at last an art-focused startup event!
Startup Weekend Art London at Wayra is the first art such event that I have come across and it happened last October 2014.

“The competition, part of the Startup Weekend series, focused on encouraging tech-based entrepreneurship in the arts. The ten participating teams had 54 hours to plan, create, and develop their business concept before pitching to a panel of judges. Judges included Tak Lo, director at Techstars and Kati Price, Head of Digital Media at the V&A.” Here is the article by Dylan Baker.
The winner, Wallto, is a startup that connects coffee shops with artists so that both can get more exposure.
For more info click here and also check the competing teams in this blog’s Startups page. Also here: