Around 150 people have turned out in Crickhowell High Street in Powys to oppose plans to convert a pub in the High Street into a convenience store.
Around 1,500 have already signed an online petition opposing the plans say campaigners.
Protestors say the town centre is almost entirely served by family-run shops and stores and the independent stores "are a major draw for tourists".
They're now trying to prevent a national chain from turning the The Corn Exchange pub into a convenience store.
The planning application will be decided by the Brecon Beacons National Park.