I'm sorry I don't quite understand your situation. Is it a showcase OR an audition for 'international' schools.
I appreciate you don't want to play something thats been done for the last 5 years!
Sorry pianowelsh.

OKAY, to make things clear, I would have to explain in greater detail.
This convention is indeed a showcase where musically gifted students from 6 international schools (JIS, TAS, SAS, ISB, ISM, ISKL) were selected to perform in front of an audience AND a group of
judges.
The BEST performers by the judges' decision would be invited to perform again in front of a larger audience where parents, friends, teachers, and outsiders come to watch them play.
My goal is to: Impress the audience and the judges so I can be invited again to play in front of a larger audience.
I might sound celf-centered and egotistical, but this has been my long-term goal and I've been working really hard to achieve that, and I only play for my own enjoyment, not for a competition.
Is it only pianists playing or are there instrumentalists from other genres represented. I only ask because if its open to all instruments you really want something that stands out as being totally pianistic, the Ravel would be excellent in this respect and it is a very fine piece and allows you to show technique and musicality in quite a concentrated time frame.
The showcase is open to all instruments (brass, woodwinds, percussions, piano, strings) and vocals. Thanks, I've been playing the Ravel for several months and I've probably mastered it enough already. I do have to take the dynamic contrast into account but it is an excellent piece to perform.
If you are looking for something about that time frame Liszt's Jeux de eau de villa d este is also very good as are any of the petraca sonettos for the Italian book and I think they would match what you describe is your temprement (nos 1&2 are more technically weighty than the third one but all are very beautifull pieces!)
I also thought about playing Liszt's Jeux d'Eau de la Villa d'Este, but my teacher said that in comparison to Ravel's Jeux d'Eau, Liszt's is lagged behind. Apparently, Ravel's has passages that are beyond brilliant in terms of musicality, technique, and tone.
If you have lots of violinists and cellists playing unaccompanied Bach I would avoid the English suites. I am a huge Scriabin fan but I'm not sure that the LH nocturne is his best work really and as I said before something which capitalizes on the fact that you are a pianist and not a cellist would be the direction I would take. Do you know any of his Impromptus or even his Fantasy in Bmin (hard but worth learning)
As far as I know, none of them is playing Bach. Apparently, they choose to play technically demaning pieces such as Sarasate's Zigeunerweisen (violin) and Bruch's Violin Concerto in GMin. My cello friend is playing Fauré's Elegie (which I find more beautiful than the rest). Anyhow, I would take your advise carefully.
I'm still a bit unfamiliar with Scriabin, however, after listening to his LH Nocturne, I have grown fond of this person. Very beautiful and lyrical.
Another wistful piece of Ravel (as you seem to like Ravel) is Oiseux Triste from Mirrors, a beautiful piece and a really good calm start in that piece is SO impressive it takes the audiences breath away.
Good guess, I do like Ravel. I've played some of his Le Tombeau de Couperin, Sonatine, Pavane, and Une Barque sur l'Ocean from Miroirs. I haven't tried Oiseaux Tristes, but I might try it after I am finished writing this response.
Thanks.