Yes. Edge's primary community is Discord. You can join the Edge server here: discord.gg/edge-network
Weekly. The latest udpate is always available in the Community Wiki.
An archive of previous weeks is also available.
Yes, from time to time, although these have been less regular since the move to Discord, as the team are active and available to answer questions as they arise.
There is an archive of previous AMAs available in the Edge Community Wiki.