Hello and welcome to the forum 
You can’t get input events in an animation blueprint.
Typically you would update variables in the Blueprint Update Animation event, by grabbing whatever you needed from the character.
If you really wanted to, you could put a custom event in the anim bp:
and forward your input event from the character to the animation blueprint:
But this is unusual (I think!), and may have issues (I honestly don’t know, never done it, never seen it done).
What are you trying to achieve here?