Framework Agreement With A Single Economic Operator Pursuant To Art. 59, Paragraph 3 Of The Same Decree For The Entrusting Of Connectivity Services, Captive Portal, Maintenance And Technical Garrison Of The Data Network And Wi -Fi Of The "Roma Convention Center - La Nuvola", The "Palazzo Dello Sport" And The "Palazzo Dei Congressi" And Other Properties Owned By "Eur S.P.A.".