There are several IC events run by different players/guilds/communities. If you’re on Tumblr, search for Wra Horde Events or Warcraft’s a Stage. You’ll also see the events advertised on on the forums and on Discord servers.
Feel free to add me on Discord as Tamani#2391 if you have more questions. My guild and several others do a monthly cross faction market event on the 3rd weekend of every month. The Gilded Market.