Used to express the condition or situation during an event, meaning 'when', 'while', 'in the case of'.
Long explanation:
The ~際に grammar point is used to express the condition or situation during an event. It can be translated as 'when', 'while', or 'in the case of' in English. The formation differs depending on whether it is used with a verb, い-adjective, な-adjective, or noun.