With post-Sandy outages, route damage and flooding, organizing the ING New York City Marathon -- with its 47,000 participants, 1,000 staff and 2 million spectators -- makes the Augean Stables look like a snap. Mayor Bloomberg said there will be alterations, the details of which will be revealed today. Officials were weighing which race-related events to reschedule or eliminate, and waiting to see how many runners would seek to defer their entries. About half of the nearly 50,000 runners take the Staten Island Ferry, which leaves from the Battery, to get to the starting line early Sunday morning. The ferry may resume service, but subways leading to the Battery may not be operating.