The memorial was also attended by Aurora Mayor Steve Hogan and Police Chief Dan Oates.
Later this week, families of other victims planned to say their final goodbyes.
Funerals were planned in towns from San Antonio, home of aspiring sportscaster Jessica Ghawi, to Crystal Lake, Ill., hometown of Navy intelligence officer John Thomas Larimer.
Three hospitals taking care of the wounded said Wednesday they would limit or completely wipe out medical bills for the victims. Some victims, many of them young, are uninsured and face mounting hospital bills. There was no immediate word on what the two other hospitals would to do.
Meanwhile, multiple news outlets were reporting Wednesday that the alleged gunman, James Holmes, had sent a package to his university before the attack in which he described a violent assault.
Citing unnamed law enforcement sources, Fox News' website reported that Holmes sent a notebook that sat in a University of Colorado, Denver, mailroom unopened since at least July 12 and wasn't found until Monday.
The university confirmed it received a suspicious package on campus that it turned over to authorities, but it did not confirm the package's contents or the sender. The university disputed that it received the package on July 12 but did not elaborate.
Fox said the notebook contained drawings of stick figures being shot and a written description of a forthcoming attack. The package containing it was addressed to a psychiatrist at the school, the website reported. It was unclear if Holmes had had any previous contact with the person. The neuroscience program that he withdrew from on June 10 included professors of psychiatry.
NBC News, also citing unnamed sources, reported that Holmes had told investigators to look for the package and that it described killing people.
On Wednesday evening, Holmes' neighbors were being allowed back home after investigators spent days combing his apartment.