As anyone familiar with Greek folk religious traditions and habits can tell you, communication between Greeks and their saints has traditionally been quite direct – saints are addressed with respect, of course, but also in a friendly and familiar manner. I myself have witnessed several people – almost always of the older generations – have a proper “conversation” (more like a monologue) with the saint of their choice.
Each saint has a particular day on which they’re celebrated; in some places, large festivals are thrown in their patron saint’s honor, with people of all ages dancing and drinking wine until the early morning hours. Throughout the year, it’s common for Greeks to make special “deals” with their saints.