with such new events as chinese "wushu"to be added,the 29th

状语从句部分,with such new events as chinese "wushu"to be added 出现” new events“ ,证明还没举行；而主句部分若用held 表示已经举行完了,显然与 will 将来不相符,故用将来时的被动语态 to be done,表“将被举行的”.
将在北京举行的29th olympic games将加入像武术这样的新运动项目