The phrase "former guests" is correct and usable in written English.
It can be used to refer to individuals who have previously stayed at a location, such as a hotel or event.
Example: "We value the feedback from our former guests to improve our services."
Alternatives: "previous visitors" or "past attendees".
Postcards from former guests adorn the walls.
These include former guests like the flutist Eugenia Aukerman and James Wilson on cello.
Former guests have left their marks on the place by planting trees - Sir Anthony and Lady Eden in 1956 and more recently Lenny Henry.
But the best information on how they might be treated comes from former guests of the regime at the main Tehran prisons.
Former guests at rather precious country houses like Garsington, they wanted to find somewhere where they could make their own lives and write a new kind of novel.
Still, he has already sold more than 60 of the 92 available units, with little more marketing effort than a few mailings to former guests at Cheeca.
The Officers and Directors of the Friars Foundation deeply mourn the loss of their former guest of honor Cy Coleman.
They're for keeps, but the playthings and baby equipment that will be littering your former guest quarters-cum-Pilates room need not be fixtures.
A former guest on a brainy British quiz show called "QI," he has an encyclopedic knowledge of music and trivia and a seemingly inexhaustible catalog of jokes.
His former guest Sharon Jones, queen of the stellar Motown funk revivalists Sharon Jones and the Dap-Kings, anchors this nu-soul revue.
(The inn, supposedly haunted by the friendly ghost of a former guest, also offers "ghost hunt" packages and is hosting a national convention of ghost fanatics next year).
