I've just woke up and that's what I found in the official site:

Q: Hi there Mr. Obbie,

I 'm from Greece and i never had the chance to see Bon Jovi live in my country...

There are many fans here and Jon won't regret it if he decides to come with his friends! It will be their first time in Athens and trust me..... A LOT of people will come to the concert!

So... just ask them if they have plans to visit us, that's all!

Thank you!

A: We are coming to Greece next year. I'll put the dates up as soon as I get them