First, make sure that the Simulation Generates Hit Events setting is enabled for the both actors (the ball and your other objects in this case). Once that’s set up, right click on the Event Graph of your ball BP, type in “Event Hit” on the menu that pops up and place the node by hitting enter. Then get an Attach Actor to Actor node, connect the Other pin of Event Hit into the Parent Actor pin of the node, connect Self (which you can drag out of the Target pin) into the Target pin, and finally change the Keep Relative selections on the node to Keep World.
Hope this helps! 