This year I am wanting to do a ritual that's little different than my normal Spring Equinox rites. Where can I find more information on the Scottish celebration of Latha na Cailliche?

Hi all. I have been reading back in the archives with great interest, but couldn't find a post discussing this in specific. I have of course heard of this idea of Brighid and the Cailleach being sort of alternate "faces" of the other or being otherwise related, but I have not found anything about that from a source that I would be really comfortable with. This leads me to think that the connection is a modern gloss.

I would be interested in hearing from anyone with better knowledge about this, and I would especially appreciate being pointed to books or other scholarly/historical resources in English that would be particularly useful to my understanding of the Cailleach. I've seen the CR reading list, but without having all of those books at my disposal to flip through, I am at the mercy of you all to steer me so that I can track the right ones down.

Also, in the single volume English trans. of the Carmina Gadelica, I noticed a note that refers to a dance called "Cailleach An Dudain", which is translated as "carlin of the mill-dust". What is a carlin? Of course I googled "carlin" which mostly turned up lists of baby names claiming it as a gaelic word for "little champion".

ETA: I would have assumed on my own that in the context of the dance, "cailleach" means old woman or hag or witch or some such, but, I am just sort of curious and wonder if the word has some entirely other meaning.

I have been wondering about this ever since a post about Pagans and offerings was made on myspace. But what would be appropriate offerings for An Cailleach? I haven't done much research into the lore as yet and am still learning, but as she is my primary Matron Goddess, I kinda want to start making offerings to her A.S.A.P. and its kinda hard if I don't honestly have a clue where to start. My first encounter and only encounter to date with this Goddess really didn't give me much of an idea what her likes and dislikes were as far as offerings go... so any help would be appreciated.