How to make a C++ event callable from within the editor?

[BrUnO_XaVIeR]

Just to add for the devs reading this (coming from google search), if you make a multicast event then customization of Details Panel isn’t needed; they show up on parent blueprint like this:

//...
DECLARE_DYNAMIC_MULTICAST_DELEGATE_TwoParams(FHSM_ExitState, uint8, StateID, FName, StateName);