Frank Grimes questline
Same thing happened to me. I guess it's because EA wanted us to be able to use Grimes instantly, but it's still kinda disappointing.
Forum Discussion
As above EA might have just temporarily suspended his main quest line for the length of the event and it could simply start once the event finishes, it could be as simple as part of the main quest line for Frank Grimes clashes with part of the Sci-fi event due to a bug so rather thansspending time trying to patch the issue they simply suspended the quests as it's quicker to do and less work for themselves, as I said hopefully they'll be back after the event as I can't recall anyone such as LPNINTENDOITA posting that the quest line had been removed but if I'm wrong about that then I'm sure someone will correct me.
