Former President Barack Obama announced Wednesday that he plans to invite civic leaders to Chicago next month to exchange ideas and plan ways to solve some of the world’s common problems. The inaugural Obama Foundation leadership summit “will be a place to gather and learn from one another, and then go back to your communities to lead others in the hard work of change,” Obama said in a video and email released to supporters. The former president said he expects the summit, which will be Oct. 31 and Nov. 1, to bring hundreds of leaders from around the world. The...