Dizzee Rascal, Athlete and Rascals all pulled out this weekend (July 4-6)
The festival, held next to Port Lympne Wild Animal Park, was also slammed for the queues entering the site and poor facilities.
Toilets were reportedly nearly overflowing and there was a lack of water taps.
The second stage at the festival was also closed for some of the day on Friday, and again for some of Sunday when a tent pole became unstable.
A spokesperson for the animal park, who did not organise the festival but worked closely with the promoters, told BBC News: “This being the first Zoo8 at the park, there were bound to be some problems but they were all resolved quickly and efficiently, mainly by our own staff who stepped in to sort things out.
“According to St John Ambulance, health and safety, the licensing office, environmental health and the police, they were all happy.”
Dizzee Rascal is currently Number One in the UK Singles Chart with ‘Dance Wiv Me’ .