Personalities from politics, business, entertainment culture and the community attended Ambassador Fabrizio Lucentini's farewell reception in Buenos Aires on Wednesday at the conclusion of his four-year term in Argentina.     In his final speech delivered from the steps overlooking the gardens of the Alvear Palace, headquarters of the Embassy, Lucentini gave a brief review of the work done in Buenos Aires in coordination with the Consulate General, ICE, the Institute of Culture, and major