Both Uses

contingency
in
The Great Gatsby
(Edited)

He was employed in a vague personal capacity — while he remained with Cody he was in turn steward, mate, skipper, secretary, and even jailor, for Dan Cody sober knew what lavish doings Dan Cody drunk might soon be about, and he provided for such contingencies by reposing more and more trust in Gatsby.
p. 100.5 *

contingencies = things that might happen
The immediate contingency overtook him, pulled him back from the edge of the theoretical abyss.
p. 121.9

contingency = thing that might happen

Definitions:

(1) (contingency)
a possible event, especially one people hope will not happen, or the extra plan or resources kept ready in case that event does happen
(2) (meaning too rare to warrant focus)