The crowd was let into the bookstore at midnight for the release party.
Yes, it is appropriate to use the passive voice in this sentence. It emphasizes the action of allowing the crowd into the bookstore without specifying who allowed them in, shifting the focus onto the crowd's action of entering.
The earlier you get to a midnight release of a game the better; first come first serve.
After Midnight - 2001 was released on: USA: 2001
Midnight Show - 2014 was released on: USA: 25 December 2014 (Wide Release)
The Midnight Toll - 1916 was released on: USA: 1 November 1916 (re-release)
Yes it will call of duty created the midnight launch.
Midnight Hard - 1971 was released on: USA: 1971
Midnight Blue - 1974 was released on: USA: 1974
After Midnight - 2002 was released on: USA: 4 April 2002
After Midnight - 1921 was released on: USA: 10 September 1921
Midnight Stroll - 2011 was released on: USA: 2011
Midnight Clear - 2006 was released on: USA: 2006