When the female shoots the shotgun and falls on the ground, the Range Officer picks up the shotgun and sweeps it in the direction of the crowd. Any experienced Range Officer would know not to point the weapon at anyone and only point it down Range.
During multiple scenes of the gala, full-automatic gunfire is heard. Fully automatic guns are illegal in the US.
During the gala, alcohol is being served to guests who are presumably going to fire weapons. It is completely irresponsible to drink alcohol and fire a weapon.