The retailer is sending staff to Marie Curie stores across London to compete against each other to manage, promote and boost sales at the charity shops.
The M&S team at the Worcester Park branch will be putting their entrepreneurial skills to the test to attract customers, raise the profile of the shop locally and ultimately boost the shop's takings for the day.
The event will feature special M&S food tastings and product giveaways, and visitors to the charity shop on Friday can be in with a chance of winning a brand new sofa and a range of summer and kitchen accessories.
And as an extra thank you, customers will receive a free bunch of flowers or some tasty Easter treats for every £15 they spend at the charity shop.
The teams across London will be judged on the percentage sales increase in each shop and how they have marketed the store.
The event runs this Friday from 9am to 4.30pm at the Marie Curie Cancer Care charity shop on Central Road (next to WH Smith).