As a reader, does that bother you? Do you like it?
It depends. I've seen it used wonderfully, a few times, but I've also seen it handled terribly multiple times. They key, as always, is in your approach. If you simply repeat the exact details, only capturing the new character's reactions, it's bound to fail, as you're asking the reader to reread the exact same passage while adding little new information (they can generally guess how the bad buy will react to things). But, if you complete change the event, capturing details only the new character noticed, excluding those he simply wasn't paying attention to, it reads as an entirely new event, and adds real value to the story as you see how similar experiences can radically alter the different characters' perceptions.
But again, it's much more often handled poorly, so consider it carefully before investing too heavily in it.
The title should be "same event."
There's no way to edit the title.
You'll have to ask Lazeez. The Admins can modify the thread titles, though I wouldn't request trivial changes, just because it takes time away from their other duties (not pointing fingers, but just a general observation to anyone else reading this).