Ss. Justa and Rufina were sisters born to a poor Christian family in Seville, Spain in the 3rd century. They helped support their family and many of the city’s poor by making pottery.
Remember that this was before Constantine, so Christians were still a persecuted minority and paganism reigned. Which is why it wasn’t particularly strange that they were asked to make pottery for a local pagan festival.
What should they do? The festival was important for their town. But as Christians, they believed the pagan festivals were gravely immoral and they wanted nothing to do with them.