We the Visitors

Elsewhere, two beings discuss the possibility of visiting the planet Earth.

"So I am to live on this large watery pebble for generally a maximum of 100 years?" the first one enquires.
"Oh yes. Although it can always end short, you never know. We can send you there from others already present in a set time period not of your choosing, but you will be there." the second answered.
Thinking, the first paused for a moment before asking, "Are we required to allow others to come into place?"
"Not necessarily, it is just that many do. They see it as a pleasure, but it is absolutely not required."
"Interesting. I should like to take upon your offer, as it does sound exciting."
"Certainly a lot more livelier than in here, I can assure you. It could very well be quite eventful, sometimes not so much -- I mean it all really is random,  but that's part of the thrill I suppose.
"Regardless, you'll typically have to relearn a new language depending where you end up, and adopt local customs. Just know that one way or another, you'll end up back here where you belong, even if you don't remember."

Excited, the first exclaims: "Well then, I accept being born into the world."