Final answer:
The designated RBS certified person at a non-profit organization's temporary alcohol event must ensure responsible service of alcohol, supervise the event, and prevent alcohol-related issues.
Step-by-step explanation:
The duty of the designated RBS certified person at a non-profit organization's temporary alcohol event is to ensure that alcohol is served responsibly and to prevent alcohol-related harm.
This includes a range of responsibilities such as staying onsite for the entire duration of the event (to supervise alcohol service, prevent underage drinking and intoxication), though it does not specifically include pouring drinks or checking every patron's ID themselves, they must ensure that these activities are carried out correctly by the staff.
Moreover, they might be involved in ensuring that patrons have a safe means of transportation home. However, the primary duty does not singularly focus on safe transportation; rather it encompasses a holistic approach to responsible alcohol service.