Which is the correct way to await for an Event in Flutter Bloc

my application is growing in complexity and I can't figure out how to handle the await of an Event, when I need to execute code after that Event. Now I'm just putting the code that I need after an event inside the Bloc and I now that this is not the way to do it, making my app a mess. This is how I am managing my app:

For example, if I need to add a user in my backend and after that, execute an action I do this in my view/screen:

BlocProvider.of<UserBloc>(context).add(AddUserEvent())

As events are async, I can't put the code after that line so Inside the UserBloc I am making:

on<HomeNavigationEvent>((event, emit) {
  #Call backend api to create user
  
  #Do my needed action
});

And some times this is even worst because I need to call another Bloc, so I have to pass the context to that Event, like this:

BlocProvider.of<UserBloc>(context).add(AddUserEvent(context))

on<HomeNavigationEvent>((event, emit) {
  #Call backend api to create user
  
  BlocProvider.of<OtherBloc>(event.context).add(MyNeededActionEvent())
});

So I think the answer is related with Bloc listener, but I don't know how to check for an event instead of a state I mean I can't do this because I am receiving the state but not the Event:

return BlocListener<UserBloc, UserState>(
      listener: (context, state) {       #I would like to have (context, state, event))
        
 
        if (event is AddUserEvent) {
          #DO my needed action
        }
})

[EDITED]

Real case of my app:

VehiculoBloc() : super(const VehiculoState(vehicle: null)) {
    
        on<GetCurrentVehicle>((event, emit) async {
    
          vehicle = await api.getCurrentVehicle();
    
          final bool showVehicleButton = vehicle != null;
          BlocProvider.of<HomeBloc>(event.context).add(ShowVehicleButtonEvent(showVehicleButton ));
          
          emit(state.copyWith(vehicle: vehicle));
        });
    }