I do my ancestor worship through genealogy and history research. It is through this research that I have learned so much about people I never knew or even heard about because my Hungarian-heritage parent had not either.
At one point in my research I got the impression that a spirit was watching over my shoulder as I constructed family charts. It was very quiet and there was a .. presence.
I also had a dream during a period of intense research of someone - the hands were ghostly mist - coming to me and showing me who they were; if I ever see a photograph of the woman that those ghostly hands held I will know.
DUMNEAZU's blog here is fascinating (with wonderful pictures!) and you can link to it and find out that there is NO HALLOWEEN IN HUNGARY but ALL SOULS DAY is H U G E !