The event will kick off at 3.30pm on the school field or inside if it is wet and all are welcome to join in the fun.
In keeping with the theme there will be bucking bronco rides, a shoot the sheriff football game, wagon rides with Gary Clemo, plus plenty of pocket money games, a bouncy castle and some refreshments from the saloon.
There will also be an exclusive preview of the children's forthcoming show,'Yee-Ha!', and a visit from the fire brigade.
Raffle prizes up for grabs include meals at the Godolphin Arms, Cutty Sark, King's Arms, Tudor Chippy, a stand-up paddleboarding or kitesurfing lesson from Ocean High, cream tea at The Coffee Lounge and tickets for Merlin Cinema, Newquay Zoo, London Zoo, Geevor, Eden Project, Land's End and the Minack Theatre.
A spokeswoman for Friends of Marazion School (FOMS), which organises the event, said it provides an essential fundraising opportunity for the school and that all proceeds will support the children's education. So far this academic year, fundraising has paid for quality sports and music equipment, a makeover of the outside learning space and a trip to the Eden Project for the whole school.
