Voxxed Days are conferences located under the umbrella of Devoxx, one of the largest IT conferences with various locations around the world.
At Greece are held in Athens and Thessaloniki with the first having attracted more than 450 developers from Greece and Europe.
The next Voxxed Day in Athens will take place on 18-20 May 2017 and will bring together popular speakers from open source technologies and professionals who want to share their knowledge and experiences.
It's an event that lasts 3 days:
a day of pre-Workshops
the main day with 2 keynote lectures, 3 topics and 17 international speakers
and one day after the workshop conference.
More information about the conference speakers and program are here.