Post Level Load event

What is the best way to do this ?
After my level has loaded (actors etc…) I would like to call an event on all actors

i would like something that is better than just creating in every level :

event begin play -> get all actors -> foreach -> myFunction

Is this possible ?

I think you answered your own problem.
But to be fair, it’s better that you call a function that is part of an interface BP, then you can loop through everything and check if they implement said function before calling.
So search for interface BP in documents and study it.