In Japanese traditions, the ceremony is usually held in the funeral home. In
Cambodian, Thai, and Ceylonese traditions, the first ceremony is held at the
bereaves home. The second ceremony is held at the funeral home and the third
ceremony is held at the home or at the temple. The right times to arrive at the
ceremony would be the time the service is called. You can sit wherever you wish if
its at the home. If its a the funeral home there will be pews of sitting. If it is held at
the home or temple of the Cambodian, Thai, and Ceylonese traditions, sitting will be
probably on the floor on meditation cushions.