One of the Buddhist practices is to spend a night in a graveyard meditating. I think if you did that you might have some interesting experiences. The purpose of it is to overcome fear of death, tho, not to contact the dead, but I've hear lots of interesting stories from people who have done that. I have a graveyard in my front yard (seriously) but never have heard from them (there are only 2 graves). I just assume they are resting in peace and have gone to where they need to be. You could do something respectful, like clean the graves or plant a flower near them. .. some kind of offering maybe.
There are some folks here who do contact the deceased and who might be more helpful. I dream of the deceased often but do not try to contact them while awake. I'm suspicious as to who it is that is actually contacting me and think that beings can take on any appearance they choose. I feel like if they want to say something to me they will show up in my dreams. I've only practised sending them away...not bringing them back!