A £5,000 Easter Charity Challenge is taking place on April 21.
Members of local charities will scour Preston’s Avenham Park for secret codes, with the correct codes unlocking three jackpot safes with thousands up for grabs from The Safe Shop.
Voting is now underway to choose the 10 charities to take part. The deadline is Friday.
A spokesman for The Safe Shop said: “There are so many great charities in the region, many of which rely entirely on fundraising, and we’re keen to give something back and help support them.”