Not sure which event the OP was doing but with regard to DCLane it is quite apparent that it is bad luck.
The Extract from their Event Rules page. They are certainly clever enough to cover themselves. On a slightly different I have done several of their events and tried to contact them to clarify a point after an event.
Several polite emails received no response, so I would be surprised if you were to get a response.
11) KILO TO GO reserves the right to terminate an individual's ride on health and safety grounds. Rides will only be postponed, re-routed or stopped for reasons of safety. Entry fees are not refundable. Entrants may not transfer or defer their entry. If KILO TO GO has to cancel an event as a result of hostilities, political unrest or other circumstances amounting to force majeure, it shall inform the entrants without delay and shall provide entrants an alternative ride in an event of comparable standard, if available.