Yes.
This is a very quick little example, this isn't supposed to be a tutorial.
You can't spawn entities, so you'll have to keep some off camera for later use.
For them to walk down, just use a move event command. Use repeat action, and skip if cannot move.
To get them back to the top, use set event location. You can use a set location, or use variable so they don't always return to the same place.