Numbers reported under absolute results use the percentage of people infectious in your community to estimate that a person in your room might be infected. So, all the forecasted probabilities are calculated accordingly, for one person, who is part of just one of the repeated events. If the outbreak is very mild in your region, the chance of any one individual being infected is low and thus all corresponding results of absolute probabilities are reduced accordingly.
Based on the percentage of infectious people in your community, the likelihood of a person within the room being infected is calculated which then yields the probability of one of the susceptible persons, attending one of the repeated events, getting infected.
Based on the calculated probability of infection and the probability of hospitalization in your extant community outbreak, this estimates how likely one of the susceptible persons, attending one of the repeated events, may get hospitalized.
Based on the calculated probability of infection and the death rate in your extant community outbreak, this estimates how likely one of the susceptible persons, attending one of the repeated events, may eventually die.
The ratio to risk of car travel deaths is used as a quick estimator of the risk level of being in such room, vis-a-vis an every day, minimally risky activity that everyone undertakes voluntarily, that is, driving a car. The numbers are based on US statistics for road deaths.