

Drink anytime...
Jon looks confused or sulks
Daenerys (or someone else) lists all her titles
A major character dies (finish your drink)
Bran has a vision or is otherwise magical
Someone mentions the Iron Throne
You see a dragon, white walker, or direwolf
You see the Night King
As usual, choose your house and drink when you hear the name, see the insignia, or hear your house motto