Pops conductor Keith Lockhart and his wife, Emiley, hosted a party for Discovering Justice at their Brookline abode this week. (Emiley is a trustee of the Boston-based nonprofit that helps educate young people about the justice system.) The guest list included, among others, Babak and Coryn Bina, Lynda and Jeff Bussgang, Nancy Gertner, Larry and Stacey Lucchino, Kathleen McGillicuddy and Ron Logue, and Helen Chin Schlichte.