The MTA's independent consultant cited " significant schedule risks" in the long-in-the-works project.
Construction will cause changes on the 4, 5, 6, 7, A, C, F, Q and S lines.
A train stations north of 168th Street will be skipped on weekends starting late Friday.
A broken rail caused major delays Thursday at about 5 p.m.
An ad for the spooky show was too "shocking and menacing," a lawsuit charges.
Changes will hit the 1, 2, 4, 5, 6, 7, A, C, E, F, 42nd Street Shuttle and Franklin Avenue Shuttle.
Due to "temporary power loss" systemwide, all subways were briefly running with delays, the MTA said.
The man exposed himself to the girl and a woman on the 5 train, police say.
Brooklyn and Queens riders can expect more trains.
Two men tried to rob a passenger on a Q train Tuesday, police said.
Police said the suspects fled into the Botanic Garden train station after the robbery.
The change is to meet ridership demand, which is at an all-time high, according to the MTA.
Riders complained that the 7 train was delayed Tuesday morning.
Authorities believe the man jumped in front of the train at Grand Central station Monday afternoon.
Joshua Garcia said the "power of the Lord" led him to save Stephanie Xue from Union Square subway track.
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