If one only read the Al Hanisim that appears in the Shemonah Esray and benching, one would not know much about the miracle of the oil. Perhaps the lighting is a public manifestation of a miracle that is much more difficult to publicly commemorate.
It is popular to light Chanuka candles in public gatherings. My extended family (about 40 people) will being getting together on a night of Chanuka in a small hall. Should/can we light with a beracha? (We expect all to have already lit at home.)