one of the main points of satanism is secrecy. many of the people who are members do not want to be branded as a satanist, so it would be a mistake to produce a list of members.
Whatever they want to really. They will perform rituals based on those created by LaVey and promote Satanisim. They celebrate Walpurgischnat in any way the want as well, check out the Satanic Bible...
We believe Satan is a metaphor/energy source for those who have the will and creativity go call upon him in rituals (which have no animal/human sacrifices). We believe the only way to truly live...