It depends on the size of the competition and who the governing body is that's sanctioning the particular competition. In men's gymnastics, for example, a local or state competition often only requires one (possibly two) judges per event. The U.S. Junior Olympic National competition requires four judges per event. The Olympics and many international competitions divide their judges into two panels: the D-panel (which determines the D-score based on the content of the routine and difficulty of its skills) and the E-panel (which determines execution and form errors). Two judges are required on the D-panel, and six judges are required on the E-panel. There are many more variations than this, but this should give you an idea of how some places break it down.
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Well there has to be a minimum of one judge per event. In a lot of club gymnastics, (private clubs that are not associated with public schools or the Olympics) the competitions will run all events at once to make the meet go quicker. In women's gymnastics there are 4 events and men's there are 6 events. Most gymnastics competitions have at least 2 judges per event to ensure any mistakes and fair judging to each performance by the gymnast. In college gymnastics, most competitions run 2 events at one time. So in that case, there could be as few as 4 judges at one Tim as opposed to 12 judges at a private club gymnastics meet. There are several factor that influence the number of judges and it is different for every meet.
There are at least 4 judges needed for one triple jump competition, two that write down the triple jump distance, one that measures in the sand and one that checks if the jumper faulted.