Druid Rituals?

What are druid rituals? I saw the movie Sarah Landon and the Paranormal Hour, and this guy named David did this druid ritual with skull-shaped turnips with candles in them. Kind of like mini jack-o-lanterns. But David found out that he was going to be killed on his 21st b-day. so a lady called him and said for him to do the ritual, and he loooked it up in a book, and saw that you had to carve fifty turnips into the shape of a skull with little tea candles in them. and for the person to be safe from a spirit, to sit in the circle of fifty turnips, and they were to wear a mask to confuse the spirit.But i am confused saying as many other druid rituals may be different from the one i am talking about. But do they actually work?