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Big on the Web - 2010 Will and Jada Smith to Be Oprah's Last Guests - 2.58 was released on:
USA: 12 May 2011
The sign should read, "Guests' rubbish only" (the rubbish of the guests).
The possessive form of the plural noun guests is guests'.
example: Our guests' comfort is our first priority.
If it means that only guests are allowed to deposit rubbish, then put an apostrophe at the end of guests: "Guests' rubbish only."