From the Harborough district council website:
Shoppers are being encouraged to visit the Harborough district and make use of free parking during the December weekends in the lead up to Christmas.
Shoppers can park for free for up to four hours in short stay car parks, and all day in long stay car parks in Harborough. Drivers will still need to register their stay and can simply do this through the ‘Pay by Phone App‘ or by getting a free ticket from the machine.
The free parking will apply on: