Mike and Danny fly a cropduster, but because of Danny's gambling debts, a local sheriff takes custody of it. Trying to earn money, they hitch-hike to the World's Fair in Seattle and, while Danny tries to earn money playing poker, Mike takes care of a small girl whose father has disappeared. Being a ladies' man, he also finds the time to court a young nurse.
Unfortunately the movie It Happened at the World's Fair is not yet available on HBO Max.
| Art | Hugh Hunt | Set Decoration |
| Sound | Leith Stevens | Original Music Composer |
| Camera | Joseph Ruttenberg | Director of Photography |
| Art | Henry Grace | Set Decoration |
| Art | E. Preston Ames | Art Direction |
| Editing | Fredric Steinkamp | Editor |
| Art | George W. Davis | Art Direction |
| Directing | Norman Taurog | Director |
| Writing | Seaman Jacobs | Writer |
| Writing | Si Rose | Writer |
| Costume & Make-Up | Sydney Guilaroff | Hairstylist |
| Costume & Make-Up | John Truwe | Makeup Artist |
| Costume & Make-Up | William Tuttle | Makeup Artist |
| Directing | Al Jennings | Assistant Director |
| Sound | Franklin Milton | Recording Supervision |
| Crew | Tom Parker | Technical Advisor |
