I guess my own words are unnecessary here, as they wrote a fantastic summary on their website:

"The Global Hack is an online hackathon designed to share and rapidly develop ideas for urgently needed solutions in the face of the current crisis, as well as to build resilience post-pandemic. The Global Hack has already drawn attention across the globe - covered by Forbes, Silicon Republic, GovInsider among others - and brought on board a fleet of world-class mentors, such as Silicon Valley’s tech superstar Steve Jurvetson, former President of Estonia Toomas Hendrik Ilves and Chris Anderson - Head of TED."

The Teams registration starts on ^ April 2020. Who wants to join?