出典:Wiktionary
Either from the fact that early train collisions often occurred out in the country alongside a cornfield rather than in a station or siding; or from staged events where two old steam locomotives were purposely run head on at each other, often in an open field, for public entertainment. In the latter idea, the term may jocularly echo field meet as a spectacle in the field involving opposing contestants.
cornfield meet (複数形 cornfield meets)