I remember considering paying thousands of dollars + travel + SF hotel to watch this last year. There's some silver lining in everyone being locked down - we can now watch all the good content from GitHub, Apple, you name, all virtual, remote.
The really interesting thing here will be how these virtual conferences replicate some of the face-to-face aspects of the real-world conferences: labs, workshops, networking with other developers, etc. Github appears to be using this as an opportunity to introduce and trial Github Discussions, for example.