(See Wharfinger's excellent voltage followers writeup if you are unfamiliar with this social phenomenom / religion)
Event handlers are the clergy of the voltage followers. Followers of the Charge worship mostly alone. But certain events draw large numbers of them:
Not all such events draw a large current of Followers. "Event handlers" are hypothesised as being charged with the task of stepping up attendance to certain events (usually claimed to hold "high potential") from a trickle to a cascade of Followers. Handlers usually "loop" around a fixed circuit, generating activity in alternating ways. Once a suitable venue is located, they summon the entire Coulombarium to attendance.
Event handlers should not be confused with emitters or collectors.
According to the terms of the "Tesla Interdiction", event handlers are of course forbidden from owning transistors. However, they aren't required to wear Tesla coils.