I forgot to bring it in with me! But I remember the details: the author is May, possibly Brian but I might just be having a Queen moment. The book is published by Hamlyn (2000), price $17.99 (sterling), and is called Chronicles of Celtic Tradition with a longer subtitle under that which I can't remember. I didn't write down the ISBN number but there's a web address on the back of the book: www.hamlyn.com I believe, or something like that (it should be fairly easy to find since Hamlyn are quite a big publisher). I would have remembered to bring it in if (a) I hadn't had no sleep last night and managed to sleep through the alarm and (b) didn't have a job interview this morning and (c) didn't have a nephew/niece due imminently - none of which is conducive for normal brain activity!
I also read a bit about Hocktide which is the Sunday, Monday and Tuesday following Easter and found out why women found the time more profitable than men: when men were bound on the women binding men day men paid the women for a kiss to release them. There's lots more information in there - loads on Beltane and the big Celtic festivals, a whole chapter on Rogation (which is in a couple of weeks) and Whitsuntide and for each feast day there's a description of who the saint (or person being commemorated) was and what's done in the various places to celebrate them. I thoroughly recommend it.
There, I hope I have redeemed myself!