The phrase "a contingent that" is correct and usable in written English.
It can be used when referring to a group or subset that is dependent on certain conditions or circumstances.
Example: "The project will proceed with a contingent that meets all the necessary requirements for funding."
Alternatives: "a group that" or "a subset that".
Philadelphia Phillies shortstop Jimmy Rollins was part of a contingent that made the trip.
That is not a contingent that is often mentioned in the official press, much less as a judge of character.
-- The Knicks started their summer renovation with a flight to California, where the owner James L. Dolan and Coach Mike D'Antoni led a contingent that met with the free agents Joe Johnson and Mike Miller.
Then, on July 21, a contingent that included Nick Espinosa, who glittered the Gingriches, spread glitter at the headquarters of Bachmann & Associates, a Christian-oriented counseling practice run by Mrs. Bachmann's husband, Marcus.
James arrived nearly four hours late at his skills academy here in his hometown with a contingent that included his business manager, Maverick Carter, the Nike executive Lynn Merritt and his former Cavaliers teammate Damon Jones.
We knew there was a contingent that was going to do their thing and there were enough of them to convince everybody else they could get off on the rebellion and the power and the noise.
At the Hammer Museum's annual Gala in the Garden fundraiser, Donald Trump and Hillary Clinton's race for the White House dominated the cocktail chatter Saturday evening as A-list artists and museum officials mixed with a celebrity contingent that included recent Emmy winner Sarah Paulson, Emma Roberts and Will Ferrell.
In the aftermath of the Oklahoma City bombing, he was part of a House contingent that helped delay and soften an antiterrorism bill.
The NIEHS played a major role in this effort, and established a North Carolina contingent that consisted of physicians, nurses, and other health care providers from both the NIEHS and Duke University.
When Kasparov is in Russia, he retains a security contingent that costs him tens of thousands of dollars a month.
But he found himself bumping up against a rival contingent that is pushing the $20 bill.
