I applaud the size of this site but its definition of "Celtic" seems a little broad and eclectic (for example it includes work by stone age people, even though the Celtic culture is, in fact, an iron-age one). It also repeats quite a lot of the usual inaccuracies reproduced in books about "Celtic Mythology" - see, for example, the entry for "Lammas" (we have a good thread on this, which is rather more accurate).

My conclusion: Good for general fun, but don't go using this to support any serious arguments.

Cheers!
Ian