/usr/include/mirclient/mir_toolkit/events/ is in libmirclient-dev 0.31.1-0ubuntu1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/mirclient/mir_toolkit/events/event.h
/usr/include/mirclient/mir_toolkit/events/input/
/usr/include/mirclient/mir_toolkit/events/input/input_event.h
/usr/include/mirclient/mir_toolkit/events/input/keyboard_event.h
/usr/include/mirclient/mir_toolkit/events/input/pointer_event.h
/usr/include/mirclient/mir_toolkit/events/input/touch_event.h
/usr/include/mirclient/mir_toolkit/events/input_configuration_event.h
/usr/include/mirclient/mir_toolkit/events/input_device_state_event.h
/usr/include/mirclient/mir_toolkit/events/keymap_event.h
/usr/include/mirclient/mir_toolkit/events/orientation_event.h
/usr/include/mirclient/mir_toolkit/events/prompt_session_event.h
/usr/include/mirclient/mir_toolkit/events/resize_event.h
/usr/include/mirclient/mir_toolkit/events/surface_event.h
/usr/include/mirclient/mir_toolkit/events/surface_output_event.h
/usr/include/mirclient/mir_toolkit/events/surface_placement.h
/usr/include/mirclient/mir_toolkit/events/window_event.h
/usr/include/mirclient/mir_toolkit/events/window_output_event.h
/usr/include/mirclient/mir_toolkit/events/window_placement.h