Darkspear Dash

It looks like you can't pick up this quest and get the toy if you don't own the Midnight expansion.
It's pretty disappointing, considering that the event gates and NPCs are set up in both versions of Silvermoon.
I hope they fix it and allow everyone to fully participate in the event, its about inclusion after all.

After Eastern Plaguelands, the quest marker tells me to teleport to Orgrimmar from Undercity, then to teleport back to Undercity, and the whole thing loops.

Instead, what you need to do is ignore the quest marker and keep going North to enter Eversong Woods and finish the race.

You don't need to run the whole distance - fly through the gates.