Gemma Prophet, who lives in Whitchurch put up posters and the banner in the village to promote the Barretstown Ball, which will support charities the Cinnamon Trust, DEBRA and the Ardley Rescue Kennels.
But the new mum, who works as a vet, was flabbergasted when the banner was slashed, and the posters were taken down on two separate occasions.
She said: “I really got quite emotional when it happened the second time.
“I don’t know why people are doing it, all they are doing is taking money away from the charities.
“Ardley Rescue Kennels do brilliant work, and they have also helped by printing the posters, so these people are taking money directly from them.”
Tickets for the event, which is on May 14 at the Barretstown Stud cost £75 a head, or £70 a head if you book a table of ten.
Guests will be treated to a prosecco reception , a three course meal with coffee and chocolates, a charity raffle and a disco until 2am.
To find out more about the event and for booking details go to the dedicated Barretstown Ball event page on Facebook.