There is no place on the menu to access the Haunted Altar activity. I've checked the Portal, the podiums at Eva and on the World Map. When I go to the quest, and try to choose Launch, it says that "The activity cannot be launched at this time." I know I must be missing someting obvious. I do have a Marauder Mask on. (Yes, I get that this is the last day, but I was planning on speed running the event having the day off today.) Thanks!