Music by the Fiesta Steel Band, Maypole dancers by Yattendon School pupils, the Kennet Morris Men and a host of traditional activities for the children.
They had previously worked together on BBC drama The Ruby in the Smoke.
Although Smith and Piper never announced they were officially a couple, a friend who was with them on the day they visited the fete says their chemistry was unmistakeable.'They were very touchy-feely and seemed really at ease with each other,' they said.
Ride the classic bicycle carousel from the late 19th century, one of only two in the world (you may have seen the other one in the Woody Allen film ).
Among more carousels, there are also flying swings, a pipe organ, and more.
A selection of wines and draft beers will be available as well.