Who administers direct democracy mechanisms at the national level?

Constitution of Venezuela (1999)  

Article 292: Electoral Power is exercised by the National Electoral Council as governing body, and by the latter's subordinate organs, the National Board of Elections, the Civil Status and Voter Registration Commission and the Commission on Political Participation and Financing, with organization and functioning as established under the pertinent organic law.

Article 293: The following are functions of Electoral Power:   […]  

(5) Organization, administration, direction and vigilance of all acts relating to elections to fill public offices by popular vote, as well as referenda.