The fact that the event is known about doesn't mean everybody is invited or it being appropriate to share pictures in a different public from the event. Let's

The fact that the event is known about doesn't mean everybody is invited or it being appropriate to share pictures in a different public from the event. Let's take some specific events: Weddings of British royalty. A simple peasant can't simply walk in and take a seat at a front row of Westminster Abbey, despite being the probably most public wedding. Or other related example: When they televised the coronation of Elizabeth II the coronation was extremely public event, probably the most public event of that decade, however the actual moment where the crown was put on her head was purposly hidden from cameras behind the bishops robe for spiritual reasons. And then consider: Weddings are often extensive celebrations, which take long, with lots of food, lots of alcohol. Many chances for unpleasant photos. Those who were there saw it, but a different public doesn't need pictures of drunk uncle Bill and the bride doesn't want the most public picture of here wedding to be the one where the dress isn't in order. Being well known doesn't take away privacy.