Have you ever participated in a seance? If not, would you consider it? What spirit would you summon and what question would you ask them? Do you believe we can get messages from the dead?
I haven't - I might attend one as a favor for a close friend if they wanted me there. If I did, though, I wouldn't be planning on trying to summon any spirit at all, or expect to get any message from the dead. I'm fairly sure that death is the end.
That said, I wouldn't object having a chance to have a real conversation with my maternal grandfather. I just think it's impossible.