Nearly 30 people were arrested downtown on Saturday night for disturbances that ranged from bumping into passersby on sidewalks to attacking passengers aboard a CTA train, authorities said, citing preliminary information. Seventeen of the people in custody -- all but two younger than 18 -- were charged with misdemeanor reckless conduct, said Chicago Police Department News Affairs Officer Hector Alfaro. Those arrests happened on the Magnificent Mile near North Michigan Avenue and East Erie Street between...