Theres also http://www.scottishmusiccentre.com/competitions/ and http://www.muziekcentrumnederland.nl/en/contemporary/internationaleconcoursen/composition-competitions/ You could also just google 'call for scores'. I did that the other night and there are piles of ensembles around the world with open calls going, I think there was about 5 choral ones I came across.
I'm trying to find out more information on the same stuff. The best I've found so far is Messiaen's contemplations of covenant and incarnation mysucal symbold of faithin the two great piano cycles of the 1940s by Siglund Bruhn. In the back of that there are some of the deci-talas. Is desi-tala another spelling of the same thing?