So I was reading through Live Jesus! a blog that I happened upon and read her post about circus nuns staying with them.
Apparently, there's are dedicated groups of nuns, priests, and brothers who travel around with circuses and minister to them. There's even an article from St Cloud about a bishop celebrating mass with them and its also about the apostolate in general.
I'd just like to see a nun in full habit swinging on the trapeze.