11-12 May 2015, University of Tampere, Tampere, Finland.
Organised by: http://gamelab.uta.fi
This is an interesting conference to attend, or present at. The Game Research Lab at Tampere University are also a friendly group of pro-active researchers; the best conference I have ever attended was their 2007 Gamers in Society seminar.
(And yes, the seminar cover photo is a little scary)