The two day charmed event was held at Oz Comic Con with Shannen, Holly and Brain on July 6 and 7th in Australia. Shannen didn't attend the USA event last month, because she was sick, which was confirmed.
I didn't attend the event, but I'm curious about what the reports were like. I did see on twitter someone asked Shannen if she would do a Charmed movie, and she replied if she was asked. This sorta makes it seem like Shannen would of really returned for the final episode, its just Brad Kern admitted he never bothered asking her, same with the comics, nobody asked her. She seemes pretty happy lately talking about the show, and has moved on from the past.