Use the search, Luka!
VocaDB is a non-profit project. All money will be used for further site development, hosting fees and software licenses.
Nico Nico Chokaigi is a yearly convention/festival hosted at Makuhari Messe, Chiba (near Tokyo). Generally there's multiple Vocaloid-related events as well, such as The Voc@loid M@ster.
Aliases: Nico Nico Chokaigi