Dear Elevate:
Let me give you three sugestions:
1) to a more conservative recital, you should pick some classical sonata (about 15 minutes) and a romantic work (Chopin, Schumann or Brahms would fit perfectly);
2) I know that's almost common place, but why not some Debussy to pair with your Ravel? Or any selection of late XIX-early XX french piano music (the nocturnes by Faure, some obscure piece by Satie, Saudades do Brasil by Milhaud...the list is endless)? I heard a recital by Mr. Pizarro this way, and it was pure magic.
3) if you want to challenge your public, try picking some other contrasting and relevant cycle. Occurs me now Prokofiev's Visions Fugitives, but there are many other.
Just some thoughts. Anyway, if you play "Twinkle twinkle little star" for 30 minutes to fill the program, yet it will be great: Gaspard is such an outstanding, unbeliveable, astonishing masterpiece that goes well with anything. By the way, why not an extended version of Cage's 433?

Best to you!
PS: it's not the case, but I did listen to a recital by Mr. Tharaud and he made something really amazing. In the program, there were Ravel's Tombeau de Couperin, and it was played with Couperin pieces between the movements of the former. Creative and very cool.
