Carlota returns to her manor before dusk, having had a only moderately helpful conversation with her seventh circle wizard acquaintance. It will be enough to go off, probably. 

She tells her staff that there are evening plans which are highly sensitive and that none of them may leave the Mansion for any reason, nor send any message. The soldiers mostly parse this correctly, and aren't bothered; the servants immediately seem to all arrive at the apprehension that she's going to spend the evening mindreading them for disloyalty so that she can find and flay whoever mentioned the censorship law to someone they shouldn't have mentioned it to.

It is probably worth communicating further in order to prevent that. "You aren't in trouble. We are planning and conducting some monster-hunting, and it would be enormously damaging for word to get out. For that reason none of you may leave. You all have the evening off, and may spend it as you like, so long as you don't leave the Mansion or contact anyone outside it. I regret any inconvenience."