The Blood Moon event is rising once again in Champions Online and Takofanes and his minions will once again rise to threaten Millennium City. During the event, players can take part in the Zombie Apocalypse PvP event and take part in missions to save fallen heroes and earn new rewards. The event kicks off Saturday, April 16th and will continue through Sunday, April 17th. With the game now free-to-play and the subscription barrier lifted, there's no reason not to head over and check it out this weekend.
Source: Champions Online Forums