Who administers direct democracy mechanisms at the national level?
Bermuda
Referendum Act, 2012
http://www.bermudalaws.bm/Laws/Consolidated%20Laws/Referendum%20Act%202012.pdf
Functions of Parliamentary Registrar
5. (1) Subject to this Act, the Parliamentary Registrar (“the Registrar”) shall—
a) be responsible for the conduct of a referendum; and
b) exercise general supervision and control over the conduct of Returning Officers in and about the conduct of a referendum.