If it is girls the Chrono crusade would be a good tragedy. If it is young blokes then g force or Robotech.
For older blokes or a mixed group bleach and for young ladies Eureka seveN. For older people Akira and evangelion are classic.
For a month long group holiday full Robotech ,Naruto ,A Gundum season and bleach to mix and match.

There is a lot to choose from these days.