From what I've heard, it is possible to pay a fee to have access to Cairn T on a different morning, possibly Saturday or Sunday depending on the weather. If anyones interested let me know and I'll make enquiries.
I will probably head up there on the three mornings it is open anyway, whatever morning the weather looks best, or all three if needs be! It really is something to experience, if anyone missed the photos I posted last year you can catch them here: http://www.shadowsandstone.com/gallery/824678