UNION – The Union Fair is like a matryoshka, Russian nesting dolls: The largest doll is the 139th edition of the fair that opened Sunday with its livestock shows and daily harness racing. Inside that is the 49th annual Maine Wild Blueberry Festival replete with a queen presiding over, well, blueberries and everything blueberry. Then the smallest doll emerges, the 47th version of the People’s United Methodist Women’s booth with its eight-member chapter selling their home-baked pies, pastries, sandwiches and light meals.

“We couldn’t open today until after church,” Connie Day said, “so today we have just two shifts, and the rest of the days three.”

Day, Anita Brown and Myrna Soule are this year’s co-chairwomen of the booth, which occupies a corner of Exposition Hall surrounded by long tables made by men from the church.

Other members of the church and community help out preparing sloppy joes and turkey sandwiches at home and delivering the goods to the booth.

“I’ve only been here for 10 years,” Day said, “but we have a woman here who has made a blueberry cake for Wednesday of fair week for 47 years.”

Many others have been baking all those years, but not for the same day, she said.

Helping out at the booth, which is a fundraiser for the church, on the first day of the fair were Day’s husband, Dan Day, their daughter Nancy Werneth and granddaughter Hannah Werneth, both of North Yarmouth.

“All the profits we make go to the church in the minister’s fund,” Day said,

Stephen Heald, a fairgoer from Westport Island, was enjoying a piece of pie at the counter.

“I never come here without stopping at this booth,” he said.

Day said the fair has changed over the years mainly in its schedule rather than its offerings. Another change was construction of the blueberry building next to Exposition Hall.

The grounds were flooded last year from the 2007 Patriots Day storm, and a temporary bridge had to be placed over the St. George River by the entrance. The parking lot was expanded with an exit to Route 131.

The fair continues until Saturday.