Sorry not an already established group but these dance and song routines should already be established and well rehearsed so would be able to preform with minimal practice.
I'll take the bait...
Any decent dance group should be able to master these dances within a few days. Your main problem may be finding a group that's available if you need them for several performances close to Christmas.
I agree. Professional dancers reguarly have to learn dance routines within a very short space of time. Between now and Christmas would be no bother. Just contact any from your local Yellow Pages.