Correction of the modified sentences: 1) After he won the prize, we are deeply moved by his donation. He 'won' the prize in the past, so your action of being moved by it has to be a 'past' action as well, therefore using ' were': 'we were deeply moved by his donation." 2) You are the youngest one around here, but you really give us the biggest moving tonight. 'moving' is also wrong here. It is not a noun again, it is a verb .The noun you derive from the verb 'move' is 'movement' , but has got another sense, than the one you want to convey here. Since I know what you want to express now, you could say for example ( there are many ways to express this meaning): "Although you are the youngest one around here, you really inspired us all tonight by your generous contribution. " You could use also use the words ' affected' , 'touched' or ' impressed'.

Hello Tsu, 1) But after winning the second prize, he did something which was really moved us. "was moved " is wrong. You rather say "which really moved us." 2) This is really touching. Although you were the youngest one, you brought us the biggest moved tonight. " you brought us the biggest moved tonight" .Here the word 'moved' doesn't make any sense. It is even a verb not a noun,which doesn't fit at all. I am not sure what you want to say here to choose the right word for you ,what did the guy bring at all? 3) We’ve already held this event two times before, and will continue to organize it once in every two years. "continue to organize it once every two years." Don't use 'in' here.