Athens - 8000 participants.
I recieved an update from a Greek friend and reader - Theodore - who reported on this year's bicycle rides in Athens and many other cities around Greece.
Nothing has changed since last year (except that more people are using bicycles), so here we are again, asking for bicycle routes, the right to carry bicycles on the subway and trains, more sidewalks for pedestrians, etc.
Here's a link to a Greek website about the ride in Athens.
Here's a link to coverage from other Greek cities, including Thessaloniki, above.
Here's a short YouTube clip from the ride in Patras.
I got this off the website last year. Lovely to see some Copenhagen Blue inspiring Greece.