In Alien: Covenant (2017) we see a flashback of David arriving at the Engineer's homeworld.
This seems to be a special event for the people living in this particular city, as thousands of them gather to look at the ship, cheering its arrival.
In the previous movie Prometheus (2012) we learned that the Engineers are a technologically advanced race who has been capable of interstellar travel for thousands of years. So why was the return of a ship such a big deal?
One theory I have heard is that these people aren't actually Engineers, but merely another race that was created by the Engineers. And they cheer because they believe their gods have returned. This would also explain their more "primitve" look.
- If these people are indeed Engineers, who have been space travelers for thousands of years, why are they so excited to see one of their ships?