You know, there's a lot of constraints on the magic of the world or, vice versa, on what they can do to entertain with magic.
Not absolute. After all, gunpowder was first used for firecrackers, even if those might be used as signals -- and to scare off ghosts -- as well as for festivals. But illusions could not be restricted to entertainment uses, and neither can conjuration or transportation.
Though there are some limits that could usefully affect them. For instance, entertainment probably can set up more thoroughly than a free-form transport. One thing to let the fair-goers to fly about the fair on a swan's back, and yet another to make the swan a useful form of transportation.