Hadfael, simply put, no. That could be one form of and RP event, but not the only way. 'Event' in this case is used to define something or anything happening ingame to some degree of being organized.. It could be a single event, such as a party, or storytelling gathering, or it could be a grand quest taking place over many weeks.
The ingame ooc RP announcement window would have categories as to what kind of RP 'event' it was, so as to make browsing them easier. The simplest and shortest category would be 'Rumors', where players just post what they heard, or other may have heard. This is easily explained how our characters may have heard something that the player did not RP in the game. Our characters exist while we are not playing (not in person, but in 'spirit'), so may hear things while we are offline. So, they may well have heard these rumors, or heard about some of the roleplay 'events' going on. It is up to the player to decide just what they do know.