Police are investigating what they say is an unprovoked assault involving a woman attacked with a hammer in Central Park, which occurred in the early hours of Monday morning. Meanwhile, the National Weather Service forecasts a rainy week ahead. Also, of the thousands of migrants arriving in New York City, nearly half of new immigrants are from places like Africa, Asia, and Europe, according to immigration court data. WNYC’s Tiffany Hanssen speaks with reporter Arya Sundaram who has analyzed the data. Finally, spring is here, and WNYC culture reporters Ryan Kailath and Precious Fondren have the scoop on cool activities for April, offering their top suggestions for things to do.