Origin and history of concourse

late 14c., "a moving, running, or flowing together; a gathering or accumulation," from Old French concours and directly from Latin concursus "a running together," from past participle of concurrere "to run together, assemble hurriedly; clash, fight," from assimilated form of com "together" (see con-) + currere "to run" (from PIE root *kers- "to run").

From early 15c. as "an assembly, a throng." The sense of "open space in a built-up place," especially a gathering place in a railway station, etc., is by 1862 in American English.

From French, English took concours d'lgance "a parade of vehicles in which the entrants are judged according to the elegance of their appearance" [OED], by 1923.