This weekend, from 11:45 p.m. Friday, May 8 to 5:00 a.m. Monday, May 11, 4 trains will not run between Bowling Green in Manhattan and New Lots Avenue in Brooklyn. This means no service in either direction at the 4/5 platforms at Borough Hall (5 trains don’t serve Brooklyn on weekends). Use the 2 or 3 as an option. Also this weekend C trains will only be running every 15 minutes or so.
The following week there are no planned changes that will seriously affect service at any local stations. From 11:45 Monday, May 11 to 5:00 a.m. Tuesday, May 12 there will be no 3 trains running, but 2 trains will be running as usual, so there will be service in both directions at Clark Street and at the 2/3 platforms at Borough Hall.