In order to carry passengers, a pilot in command (PIC) must have conducted 3 takeoffs and landings within 90 days in addition to a current flight review.
To be current to carry passengers at night, the PIC must have completed 3 takeoffs and landings during night time, between 1 hour after sunset and 1 hour before sunrise to a full stop. In either case, to log the takeoffs and landings, the pilot must have been the sole manipulator of the controls. For the flight to count for helicopter currency it must have been conducted in a helicopter as the regulation requires the flight to be in the same category (rotorcraft) and class (helicopter) and type if a type rating is required. Under certain circumstances, flight currency could be conducted in a flight simulator. For IFR currency, there are additional requirements.
14 CFR 61.57 Recent flight experience: Pilot in command