@VelikyPanda
I think you should be able to override the function in Blueprint, but since you have an Event, it may be worth converting to a function, so you can have output. You can achieve that by right-clicking on the blueprint node.
To override, if you go into your blueprints, you should be able to find the functions menu, and there is an override drop-down menu next to functions. You should be able to select override from there:
I hope this can help!
-Zen