Music lovers are being urged not to take valuables such as stereos and mobile phones to the Reading Festival.
Police are to set up a temporary station at the festival site
Thames Valley Police, who will be patrolling the Berkshire event with 250 officers, are urging people to take only what they really need.
With just days to go before the festival kicks off, they are warning that items like gas stoves and sleeping bags left in tents will be stolen.
More than 50,000 revellers are expected at the Richfield Avenue site.
The August Bank Holiday weekend festival is said to bring in more than £7m to the town.
A police spokesman said: "The huge majority of offences committed at the festival last year were thefts from tents and all the crimes could have been prevented if people had taken care of their belongings and kept them on their person at all times."
Visitors are also being warned to be extra vigilant for pick-pockets and robbers.
A temporary police station and prisoner handling unit will be set up at the site, police said.