Since the name length of a traffic event is technically restricted also the WME limits the name input after the maximum length ist reached
(https://waze.uservoice.com/forums/59225-map-editor-suggestions/suggestions/41814004-limit-name-input-in-event-mode implemented).

It would be even more helpful if there would be a char counter that shows the remaining length for the name.

This requested behavior is already the case for entry boxes of map comments and URs.