I have some problems with Gravity Forms, normally it works out of the boks with StudioPress Themes. But in this Theme the data picker is not working!
look for this "Hvilken dato overvejer du at høre Torbens foredrag"
I found this, but i dont know if thats it?
here another site of mine, almost same theme: http://hardthaus.de/tisch-reservieren/tisch-reservieren/ with date picker working !