I quite liked this, but throughout the episodes I kept comparing it to Lost and I found so many similarities. There's a plane crash, EM radiation has already been mentioned which could have caused the portal (kind of what happened in Lost), there are a group of people we don't know much about (the others).
Although I quite liked this and I will probably keep on watching this, one thing that I hated about The Event is that I didn't like or care about any of the characters, except for Agent Lee. All of the characters took themselves too seriously and I couldn't warm to any of them especially the main character and his girlfriend. They'll probably develop their characters in later episodes but I'll still think they will have zero chemistry and will still be incredibly boring. At least in Lost, even though you sometimes couldn't follow the storyline, you could follow the characters as they were so likeable and interesting and (most of) the romance plots actually worked.
However I would love this show if it did introduce time travel or parallel universes rather than aliens.