I got the Silithus questline which takes you back to Dalaran, then after that it made you get Brann Bronzebeard then the quest from Khadar to complete an event. That’s about it I think.
If you’re talking about the older quest line where you go into Telogrus Rift with Alleria then you should be able to go into Stormwind Keep in the library area in the back.