What? I have never had to kill any dinos to put tame multipliers into effect.
try it it works with me
Thinking about it, my understanding is that Ark will spawn a certain number of creatures, and new ones will not be spawned until an existing creature dies. So if you have a full spawn and an event kicks in, the game won't be able to spawn an event dino until there is room on the map. Even when a creature dies it's no guarantee of an event dino spawning. However, by wiping all the wild dinos then the game will repopulate the whole island from scratch, and the chances of an event dino spawning is greatly increased. I could of course be wrong as I am not a developer, but it makes sense to me. Perhaps that's why I thought it odd when you said to kill all the dinos as I have never had to do that to spawn event dinos, though because I don't do that it is slower for me to see them.
I only just started seeing event dinos last night (Bunny Dodos and their multicoloured eggs).