The Obtainable Pokemon gives a visual representation of some of the event mons are, but like Chubb said, make sure the thread isn't outdated. The current Pokémon Location Guide v3 (Episode 15) should be up to date with some minor issues here and there, but it should still help you out. If the descriptions that come with the locations aren't that helpful, just ask a question in that thread or post in the Ask Your Questions: Quests, Pokemon/Item Locations, and Other Information thread.