This pan-European non-profit online hackathon is led by the European Commission, in close collaboration with the 27 Member States and 6 associated countries to H2020, and the teams organising national hackathons in EU member states. It is taking place between 24 and 26 April 2020, and will bring together international teams to suggest new solutions to challenges or adapt and scale-up the existing ones.
You can have a look at the website to get more information here