ZM: Yes, Kathy, some sports require silence at specific times during the game or match. Respect this by honoring the rules and signals from the officials.
K: Interestingly, the biathlon is one of the sports where fans need to be aware of the need for silence when the athletes are doing the target shooting. Actually biathlon fans generally follow two unspoken rules: stay quiet when a biathlete is shooting at the target, and do not cheer when a competitor from another country misses.