A vulnerable teen embarks on a sinister online game in this uneasy, ultra-low-budget psychological horror. We’re All Going to the World’s Fair captures something of the hostile virtual terrain that today’s kids learn to navigate, encountering unknowable horrors that subtly change them for ever. As such, it probably taps more successfully into parental paranoia than it does into actual dark-web peril. Unfortunately, the film runs out of ideas and steam before it delivers any real scares.