Back in H4 (Maybe even in 3 or Reach, I’m not sure) there was Community Forge Events. They we’re a short term challenge for forgers to build the best maps in a given game type (The last one to be hosted in 4 was Race I believe) If your map is good enough, it could be submitted to 343i. If they like it, they would put it in the dedicated playlist for the event. I personally loved playing on other forgers’ maps.