The 122,000-ton Celebrity Equinox is expected to navigate backwards (for manueverability) through the narrow River Ems from Papenburg, Germany to Eemshaven, Netherlands. The event is called a conveyance. Tide, winds and depth must jive for the conveyance to occur given the massive size of the ship and the narrow river.
In a conveyance the ship is moved from the shipyard down the river to a facility where it is then completely outfitted to begin sea trials, etc. Conveyances are huge events and thousands line the river. Hence you can see the travel trailers in the distance as taken from the ship.