Memorial service to commemorate the 25th anniversary of the Sept. 11, 2001, terrorist attacks and remember all who lost their lives that day. Fire chief Mike Kennedy, police chief Andre C. Anderson, city administrator Milton Dohoney Jr., mayor Christopher Taylor and U.S. rep. Debbie Dingell all give remarks. 9 a.m., Fire Station No. 1, 111 N. Fifth Ave. Free. a2gov.org/news/posts/ann-arbor-fire-and-police-departments-to-hold-sept-11-memorial-service.