I thought those were Monty Python events rather than Olympic events...Is this the three-legged 100yrds or the backwards 100yrds?
But no. Just to add a confusing clue, it has nothing to do with any specific event, but would likely only happen in a specific kind of event.
Were they real 'running deer' that were being shot at - if so I can understand why the event disappeared from the agenda. Oscar Swahn became the oldest gold medal winner ever at just short of 65 years of age in the running deer shooting competition.