Taken from CHDBITS WEIBO:

【公告】为迎接中秋、国庆双节的到来，经CHDBits管理组讨论决定，在双节期间进行如下庆 祝活动：<1 > 9月30日9点至10月3日9点，全场FREE三天；<2> 9月30日9点至10月8日9点，开放普通会员的CHDBits邀请权限八天，同时邀请码购买价 格5折优惠 （即由原来的10万魔力值降为5万魔力值），欢迎广大会员踊跃参加.


Translation using Google Translate :

[Announcement] to greet the Mid-Autumn Festival, the arrival of the Day double CHDBits management group discussed and decided in a double period following celebrations: <1> September 30, 2011 from 9:00 am to October 9 o'clock, FREE game threedays; <2> at 9 o'clock on September 30 to October 8, 9 o'clock, the open the CHDBits invitation of the Member permission for eight days, while an invitation code purchase price 5% discount (from 100,000 Mana reduced to 50,000magic value), to welcome members to join.