I agree, I think it should be mixed, whenever you attend a more than one day event like say T in the park or something, they don't out all the newer acts on one night and the more well known ones on the next, nobody would come for the first day. once the final lineup of bands is certain, I woud take what you think is your two bigest crowd pullers and put one on each night.
Imagine a situation like when your kids, ther is 12 of ya and the two best players pick sides for a game of footy, each picks a player he wants until they get down to the fat kid, that way you have a good selection each night and the headliners will pull along the people who really want to be there for the night to hear their favorite band top it all off.
I am of the opinion putting all young bands on one night and all older bands on the next night may be a disaster. But its early days and these are the things you got to think about.
good luck
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