Although this recent update has broken the in-game
/server command (it now only tells you the realm which is useless because you can already read it from the Realm Quests display)…
There is still a way to find out what server you are on, if you do:
/tell mreyeball server
That gives you the server, and put that together with the Realm Quests display, or /server if you have the RQ off, for the realm name, and you have your location.
Happy event calling!