Youngsters can fundraise while they have fun at the worldwide travelling theme park experience, currently on Mitcham Common.
This year the theme park experience has teamed up with schools in Mitcham, Morden, Wimbledon and Croydon in a money-off voucher scheme.
Schools have been given vouchers for money off the fixed entry price while 25p from each voucher redeemed will be donated back to the school.
Monty Hammond, park manager, said: “I am delighted we are able to make such an important contribution to the community and to be working so closely with the schools in this area.”
Mr Hammond said he hoped other businesses would be encouraged to follow suit.
The fair will run on the common until April 18.
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