For debug and feedback purposes, here are the requirements for activating Yamatai's Narrative Events. If they don't fire when you expect them to, or otherwise don't work as intended, let me know here!

• Play as Yamatai
  
• Construct 3 Burial Jars Improvements

• Play as Yamatai
  
• Research the Wei Embassy Civic
  
• Improve 2 Silk Resources

• Play as Yamatai
  
• Research the Wei Embassy II Civic
  
• Lose at least two Infantry Units in combat
  
• Be in a war with less Support than your opponent

• Play as Yamatai
  
• Have a Settlement with both an improved source of Rice and an improved source of Wine

• One of the following:
  
  • Play as Himiko, Queen of Wa
    
  • Play as Himiko, High Shaman
• Construct the Hashihaka Kofun Wonder

• Play as Yamatai
  
• One of the following:
  
  • Play as Himiko, Queen of Wa
    
  • Play as Himiko, High Shaman
• Research the Wet-Rice Cultivation Civic
  
• Have a Settlement with an improved source of Rice reach 10 Population
  
• Be in a Celebration

• Reach the Modern Age, having played as Yamatai during Antiquity
  
• Research the Natural History Civic
  
• Have a Burial Jars Improvement in the Capital and one other Settlement