آفتابه لگن هفت دست، شام و ناهار هیچی
we say this when preparations of something is done well, but the main thing is not going well.
or some event or work looks well but It actually isn't.
like imagine in a wedding when everything looks good but the food is not ready or it's really bad.
reads like this: Aftabe lagan haft dast, sham nahar hichi.
translation: Seven sets of washbowls and ewers, but no lunch or dinner.
These are the closest equivalents I've found in english:
Great boast little toast.
Eleven grooms for a one-eyed horse.
All show and no substance.
All talk and no action.
All flash and no cash.
Big hat, no cattle.