At Samhain, the veil between the worlds is at its thinnest. What an opportunity!
That is not to say that at other times of the year, the veil is thick and impenetrable. Quite the contrary, especially if you have some experience! But, this is the time when the veil is at its thinnest. Because of that, if you are learning, this is the time when you have the best chances of a positive result.
And, most of us know someone on the other side of the veil, and most of us know someone there with whom there is infinished business - if only a chance to say goodbye!
And so, you have a twofold opportunity. You get to do something with better chances of it working (and gaining experience), and at the same time you can clear up unfinished business!