So call me fixated on helicopter lifts.
This weekend there are two -- count 'em, TWO! -- helicopter lifts affecting service for the #20 Madison and #56 Milwaukee (lift at 101 N. Wacker, from 9-10 am Saturday and 8-10 Sunday) and the #22 Clark and #62 Archer (lift at 500 S. Dearborn, from 9-10 am Saturday. Watch out above!
And of course, the Blue Line slow zone work again will shut the subway/El from Washington to Western. Shuttle buses will hit all the stations in between.
A few other bus routes are changed due to various festivals, including Pitchfork, Chinatown Summer Fair, and the 63rd Street Music Festival.