The Oxi concert was a concert/Rally held on Friday 3 July 2015 in Syntagma square to support the NO vote in the 2015 Greek bailout referendum.

Performers included Thanos Mikroutsikos, Vasilis Papakonstantinou, Alkinoos Ioannidis, Rita Antonopoulou, Afroditi Manou, Sokratis Malamas, Rallia Xristidou, Kostas Thomaidis, Electric Litany, Iro, Eleni Vitali and Chainides.

[7] Many Members of the Greek government and the SYRIZA party like Zoi Konstantopoulou,[8] Nikos Pappas and Yanis Varoufakis[9] attended the concert.

The concert was announced for the 3 July 2015 at 7:30pm, with the organizers stating "We are giving an answer to the fear climate they want to impose, with our songs, with our loud voice".

At the same time another concert was held in Thessaloniki with Thanasis Papakonstantinou, Matoula Zamani and Giorgos Kazantzis performing.