english into chinese

"It is to establish a charity event to support an organization on the highest international possible level."
I understood most of the sentence, but confuse of "on the highest international possible level".
In my mind, the chinese should be"举办一个最高国际级别的慈善活动来支持一个组织"or"举办一个慈善活动来支持一个组织在最高国际水平"
I do not know how to translate it correctly.
I am now asking for help.