Age of Ultron (Comic Book Industry Events and Awards)

Set in an apocalyptic future, Ultron has returned to earth, and ruined it, using his superior technology to enslave the mankind. Certain villains do as Ultron commands and get higher privileges but at the end of the day Ultron rules. Most of the heroes live underground whilst thinking of a way to rid the world of Ultron. Amongst these heroes are Captain America, Luke Cage, Iron Man, and Emma Frost. Hawkeye is with them, but he's willing to go out into Ultron's world if it means saving his friends. The event follows the heroes plan to prevent Ultron from ever returning from the future, and the consequences of these actions.

Reading Order (as stated on Event Card)

Avengers: Age of Ultron Point One (Prologue)
Age of Ultron #1
Age of Ultron #2
Fantastic Four #5AU
Superior Spider-Man #6AU
Age of Ultron #3
Age of Ultron #4
Ultron #1AU
Avengers Assemble #14AU
Age of Ultron #5
Wolverine & the X-Men #27AU
Age of Ultron #6
Age of Ultron #7
Avengers Assemble #15AU
Age of Ultron #8
Uncanny Avengers #8AU
Fearless Defenders #4AU
Age of Ultron #9
Age of Ultron #10
Age of Ultron #10A.I. (Epilogue)

Source:

http://comicvine.gamespot.com/age-of-ultron/4045-57031/