Martin McDonagh’s darkly comic drama “Three Billboards Outside Ebbing, Missouri” will be the closing-night film of the 61st BFI London Film Festival. The film, which stars Frances McDormand, Woody Harrelson and Sam Rockwell, will receive its U.K. premiere Oct. 15 at London’s Odeon Leicester Square. McDonagh, McDormand and Rockwell are all expected to attend.