Britain's oldest pancake race is being held in Olney near Milton Keynes.
The race dates back to 1445 and it's believed it all began with a woman who was late for the Shriving service at Olney Parish Church.
The main race happens shortly before noon but children's races are held during the morning.
Thames Valley Police have arrested four men in High Wycombe, Buckinghamshire as part of an investigation into child exploitation called Operation Ribbon.
Four warrants under the Sexual Offences Act led to the arrests of the men who are aged 19, 20, 21 and 22. All are currently in police custody.
Detective Chief Inspector Vince Grey, leading the investigation, said: “We will not tolerate child exploitation in the Wycombe District and today’s warrants are part of a lengthy investigation spanning many months."
Police are urging any victims who have not yet come forward to call them in confidence on 01296 396396.