Festival isn't quite the right word. Apparently there's a league system and those were some kind of playoffs. Or major tournament? Whatever. The variations on robot sports is too much to grasp in a moment.
Church. Okay, there is a church to Fricassa. It's buried underground, and seemingly an exact duplicate of a large church in Coppertop. Well, a nearly exact duplicate. The benches and doorways and ceilings are all dwarf-sized, but in the main room, in place of a dwarven metalsmithing workshop, there's a steam hammer in the corner. Not dwarf-tech. The rest looks all dwarven, all the time, and the room is completely plated in copper, with all the main furniture being solid lead. The altar is different, being made of a single shaped limestone boulder, quite obviously not from here. The holy books are also different, printed and identical, but covered in dust. There are a few locked internal chambers, but this place looks like nobody has came in here for months.
Outside the building you figure out why. Apparently the services are held through the bizarre robot communication method, with the church there simply because you need a church and an altar to do it properly, although Fricassa seems perfectly content to handle things through the strange remote ritual setup the robot has.
That said, it doesn't really indicate how you are to engage in such a thing, given that your brains don't work that way. You could always just use the altar like it's supposed to be used, completely ignoring the whole 'local priest' thing..