So how do nodes actually find each other?
Addresses of pub servers are shared on the network and used for connecting. Nodes on the same LAN discover eachother using UDP broadcast packets. Using an invite code triggers connecting to a node at a specific address.
What happen if one fork it’s own log of event?
Peers won’t accept new messages that reuse a sequence number of an existing message in the feed. So they will stop being able to replicate that feed.