I read Justin's response with some interest. One Greek heirarch who adheres to the Church Calendar wrote to once and warned against, "Any who would be perfect". On several visits to a Matthewite Church I actually met this. The priest was a lovely married priest, and so too were some of the congregation. However, some quizzed me in the smallest detail about when visitors were baptised, was it before this date or after that one. Asked why it was so extremely important, I was told the dates determined whether they were Orthodox or not.
A priest friend came across another group of Greeks of the Church Calendar persuasion. They had no access to a priest. He was 'doing' a funeral for them. In neighbourly spirit he offered to come and celebrate the occasional service for them. No, Father, no need. In this case he suspected that being so strict provided a perfect excuse simply not to go to services while being able to tut, tut about everyone else!
But as I have written before there is a New Calendar but no Old Calendar, only the Church Calendar born out of centuries of heroic struggle.