Reading Festival-goers are being urged not to destroy their tents after this year's event but instead donate them to those affected by the Pakistan floods.
Police said many tents were thrown away or set on fire at the end of the three-day festival last year.
Volunteers will be advising people at the site how they can donate equipment to help the five million Pakistanis who currently have no shelter.
American rock group Guns N' Roses will headline the first night on Friday.
Other acts due to perform are Arcade Fire and Blink 182.
Det Insp Simon Bedwell said: "Many festival-goers buy tents specifically for the festival and throw them away or destroy them afterwards.
"Last year we had a particular problem with a minority burning their tents.
"This seems a sad waste, particularly at a time when people living in places like Pakistan are struggling for basic shelter."
UN officials said more than 1,500 people have died in the floods while 17 million have been directly affected.
The British public has so far donated more than £35m to the aid effort through the Disasters Emergency Committee (DEC).