Peter Jackson’s World War I documentary They Shall Not Grow Old, which Warner Bros. acquired global rights to following the pic’s BFI London Film Fest premiere in October, drew an impressive $2.3M at last night’s Fathom Event which took place in 1,122 theaters over two showtimes (4pm & 7pm). Fathom reports that They Shall Not Grow Old was their largest event year-to-do date at the B.O. out of 160, their largest documentary ever and the fourth largest event of all-time at the domestic B.O. Cineplex Event Screens showed the doc in Canada.