Incharge of a large japanese conference. What to do?

Hi everyone, recently my department announced a big conference with delegates coming from japan, china, korea, taiwan etc just for the conference. I was asked to be incharge for all the performances throughtout the conference. All of which has to be japanese or related to japan.

I decided a song :- 世界に一つだけの花 for the ending. My friend will be performing a dance(shes good at it so i am not that concerned)

Here's comes the question:- one of the teachers is really forcing us to do some cosplay stage performance but none of us has any idea, it cannot be romantic in any sense(tried doing kimi no na wa) but last suggestion came to perform Doraemon no uta. What would be better choice to perform? Any suggestions?

Also any idea what more performances we could do? Any suggestion will do. If just needs to be fun and respectful and japanese.