No, because I already got my Manaphy from Pokémon Ranger. Other than that, my other reasons would be:
-The event didn't appear to be advertised that well. Sure, it was on the official Pokémon website, but when there's an event, usually the majority of fansites would have an article on it or something.
-I don't live in America. Although I have gotten Celebi at JAA, it was at least a major event promotion, and I was given enough time to prepare for my own journey to America. I have only caught word of the Manaphy event just now, so I couldn't possibly have made it in time.