If you're able to get to Santiago (Chile) on the 8th of February then you can listen to two great talks. The first talk is by Felipe Alfonso, the leader renderer developer of Phaser 3, all about learning how to get started with shaders and WebGL. The second talk is by Jorge Palacios all about getting started with Phaser.
There are also lightning talks and of course you get to join in with the local JavaScript community.
While Felipe won't be talking about Phaser 3 specifically, I'm sure he'll be only too happy to answer questions relating to it after the presentations :)