An 1 Bealtaine 2004, chuaigh 10 mBallstát nua isteach san Aontas Eorpach: Poblacht na Seice, an Eastóin, an Chipir, an Laitvia, an Liotuáin, an Ungáir, Málta, an Pholainn, an tSlóvaic agus an tSlóivéin. Ba é sin an méadú aonair ba mhó ó thaobh pobal agus tíortha araon. Ina theannta sin, thug an t-aontachas sin réimse leathan de stair náisiúnta, de chultúir agus de thraidisiúin dhlíthiúla chuig spás coiteann dlíthiúil an Aontais. I bhfianaise mhéid an chomhtháthaithe a bhí bainte amach ag an Aontas Eorpach faoi 2004, ar thaobh amháin, agus an éagsúlacht a léirigh na deich mBallstát nua, ar an taobh eile, ní féidir an iomarca béime a chur ar thábhacht na tréimhse sin. Is cóir a rá gur tráth bunreachtúil a bhí i méadú 2004 ann féin – athrú paraidíme – inar tháinig Oirthear agus Iarthar na hEorpa le chéile mar chomhthionscadal bunreachtúil. Leathnaigh an tAontas Eorpach a chuid luachanna agus a phrionsabail chuig codanna den Eoraip a bhfuil stair an-chasta acu. Cé gur tháinig na 10 mBallstát nua isteach san Aontas le diongbháilteacht agus dóchas ar leith don tsaoirse, don cheartas agus don rathúnas, dhéanfaí tástáil ar an diongbháilteacht sin le dúshláin mhóra.

In 2022, cheiliúir Cúirt Bhreithiúnais an Aontais Eorpaigh cothrom 70 bliain a bunaithe. In ómós na hócáide, tharla roinnt imeachtaí i gcaitheamh na bliana, go háirithe Fóram na mBreithiúna ar an téama “Ceartas atá gar don saoránach”, Éisteacht Shollúnta agus eisiúint stampa chomórtha.

Farewell ceremonies for the British judges of the Court of Justice of the European Union, Ian Forrester (General Court) and Christopher Vajda (Court of Justice), were held on 6th and 12th February respectively.

On 13 May 2013, at the seat of the Court of Justice in Luxembourg, a day of reflection took place to commemorate the 50th anniversary of the judgment in Van Gend en Loos, delivered on 5 February 1963. During the day, the judgment was examined as a source of and a framework for the principles which have shaped the constitutional structure of the European Union and from the point of view of its potential for promoting the future development of European integration. The conference, which was organised by a committee chaired by President of Chamber A. Tizzano and composed of Advocate General J. Kokott and Judge S. Prechal, was addressed to all law professionals and the academic world of the European Union. The deliberations were conducted in French and English.

To mark the 30th anniversary of the establishment of the General Court of the European Union, a symposium was held on 25 September 2019 at the Court of Justice of the European Union.