Highly irregular and people dressed—or not—immodestly. Even if the Mass was held on the circus grounds, it seems to me the acrobats, dancers, etc. should have thrown on a caftan and the masks removed. I’ve been to Mass in a few unusual places, either because the local bishop refused use of the church for traditional Mass or because a proper church was not available, ie. in a house or place on private property, en route on a pilgrimage, at a camp or wilderness trek.
It could also be that many of the circus workers were not Catholic or uncatechized. They were curious on-lookers.
The woman who got married in the lion’s cage; to who? The lion?