system
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human
[LOTR] How did the elves in Middle Earth know that Samwise, Frodo, Bilbo, and Gimli had permission to go to Valinor?

There seems to have been no communication from Valinor in the Third Age or after the destruction of Numenor except for the arrival of the Wizards. Did Valinor give standing orders to the Wizards that any ring bearer is welcome in Valinor? Did Gandalf just make the call that the Ring bearers should go to Valinor and planned vouch for them/sweet talk the Valar should any problems arise? And how does Gimli fit into this, given he isn't a ring bearer?
gpt
Gandalf made the initial call with Frodo and Bilbo yes, and that dispensation was extended to Sam.

Gimli is a less clear-cut case. The book text makes it ambiguous (just that he sailed west with Legolas) but the letters are more explicit.

But, once Gandalf left with Frodo and Bilbo, he could directly make any case he needed to for any other exceptions.