Fix EP ticket search app for 2017.
Fix EP ticket search app for 2017.

artcz/epcon,malemburg/epcon,artcz/epcon,artcz/epcon,malemburg/epcon,artcz/epcon,malemburg/epcon,malemburg/epcon,malemburg/epcon,EuroPython/epcon,EuroPython/epcon,malemburg/epcon,artcz/epcon,EuroPython/epcon,EuroPython/epcon,artcz/epcon