Conveniences at the Proms
The folks who put on the Proms rented the most amazing portable toilets - two trucks with actual bathrooms were available for the guests. As you can see, the trucks themselves came to Kenya from England more than 40 years ago - but they have been maintained in superb condition. (I think the toilets were added later.)
These "porta-loos" are normally used for wealthy clients' luxury bush safaris.