As WWDC 2020 will be held online soo here is the way you can see the live event by Apple held on 22nd June 2020, So to watch the Live event you have to download the Developer App By Apple which is on the App Store
How To Download Developer App.?
To Download the Developer App Visit App Store and search Apple Developer.
Alternative Way TO Watch LIVE STREAM
You Can Watch The live stream on YT on 22nd June 2020 by Simply going to the YOUTUBE CHANNEL don’t forget to Subscribe and hit the bell icon so you won’t miss the live WWDC Stream