Voxxed Days are conferences under the umbrella of Devoxx, one of the largest information technologys 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 18-20 May 2017 and will gather popular speakers from technologies open source and professionals willing to share their knowledge and experiences.
It's an event that lasts 3 days:
a day of pre-Workshops
the main conference with 2 keynote speeches, 3 thematic sections and 17 international speakers
and one day after the workshop conference.
More information about the conference speakers and the program are here.