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Red Carpet from WikiPedia:

A red carpet is traditionally used to mark the route taken by heads of state on ceremonial and formal occasions, and has in recent decades been extended to use by VIPs and celebrities at formal events.

More generally "red carpet treatment" and "rolling out the red carpet", refer to any special efforts made in the interests of hospitality.

The earliest known reference to walking a red carpet in literature is in the play Agamemnon by Aeschylus, written in 458 BC. When the title character returns from Troy, he is greeted by his vengeful wife Clytemnestra who offers him a red path to walk upon:

"Now my beloved, step down from your chariot, and let not your foot, my lord, touch the Earth. Servants, let there be spread before the house he never expected to see, where Justice leads him in, a crimson path."

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