A "signaling event" is a situation or action that indicates or communicates something important to others. It is a way of conveying a message or sending a signal to capture attention or make people aware of a particular thing. Full definition
We also do culture of cells and tissues isolated from mice to manipulate signaling events in controlled, measurable ways. (vicc.org)
We then interpret this as evidence that the two proteins of interest are physically interacting with each other — a molecular signaling event. (sciencedaily.com)
There are about 1,000 times as many background electromagnetic events as there are predicted signal events. (discovermagazine.com)