The curtain finally rose. The audience gasped. ◼️When the curtain finally rose, the audience gasped.
◼️The curtain finally rose, but the audience gasped.
The curtain finally rose, unless the audience gasped.
Although the curtain finally rose, the audience gasped.

When the curtain finally rose, the audience gasped.

an informal structure in a bureaucracy would be something like so-called "office politics". where there's a formal structure set up for the organization, but then an informal subculture as well that has a way of organizing the bureaucracy further. this can be positive because it sets up an added degree of organization, albeit informal, within the bureaucracy.