What you output does not necessarily mean that it is empty, what you are seeing is the data type, which states it’s an array of Event. To get the number, you would have to use the Length.
I would strongly recommend going through the UiPath training in order to understand collections. If you want something quick, consider looking at StackOverflow or the Microsoft documentation.
Thank you for your answer, i have followed all the trainings on UiPath Academy, but i have the feeling that array for GoogleAgenda have some specifications i can’t understand