Quoting the official announcement:
As tickets to Google I/O were sold out within ~50 minutes, worldwide “Google I/O Extended Events” (mostly organized by GTUGs) will make it possible to watch the keynotes live on a stable stream with other interested developers, fans and friends.
The Stuttgart GTUG and the Black Forest GTUG join in together to bring Google I/O to Stuttgart!
There will be food & drinks – and Swag – for all participants and a (hopefully) stable livestream.
Please register to let us know how many people are attending!
Costs: It’s free!