Perhaps it was the sense of electricity in the room, but something very unscheduled was going on.
"Syndrome"
Thomas Hoover
Leaving out much that was incomprehensible or nearly so, Barney could still construe a fairly specific picture of the association project of which he was now an unscheduled and unwilling part.
"Gone Fishing"
James H. Schmitz
Now, he had half an hour extra for the unscheduled major hazard.
"A Matter of Proportion"
Anne Walker