This is a losing argument Luai. But I totally love listening to you anyway!

You are awesome!
Heehee, thanks. I know I'm not going to get anywhere with it, but I just can't not say anything. It makes me ANGRY. I don't hold anything against christians, in fact a lot of of my close friends & people I look up to are christian; what I can't stand is people who are clueless about their own religion's history and CHOOSE to be that way. 
It is my understanding that the other festivals were resurrected from other pre-Christian religions in the Nineteen-Sixties when a new interest in older faiths was ignited by the flower-power era.
The eight-point wheel, I believe, was created in America in the Nineteen-Seventies.
It's true that a lot of "rediscovered" ancient traditions were actually invented in the modern era- a lot of them before 1960 actually. Wicca was introduced in 1954, a lot of it based on material from an earlier revival in 1920. Some of that was valid, based on the few surviving pagan traditions we have, and/or extracted from the adaptations the Christians made to Pagan traditions; some of it was conjecture. A small fraction of it was entirely invented.
In reference only to the festivals, from wikipedia:
Most of the holidays of the Wheel of the Year are named after Pre-Christian Celtic and Pre-Christian Germanic religious festivals. However, a great deal of liberty has usually been taken with the forms and meanings of these festivals, due to the influence of turn of the century romanticism as well as the eclectic elements introduced by Wicca. The similarities between these holidays generally end at the shared names, as Wicca makes no effort to reconstruct these ancient practices.[4] Wiccans observe the festivals of the Wheel of the Year together in a form of universalism not corroborated by any historical continuity.[4]
There is no place in Europe where all eight festivals have been observed as a set, and the complete eightfold Wheel of the Year was unknown prior to modern Wicca.[4] In early forms of Wicca only the cross-quarter days were observed. However, in 1958 the members of Bricket Wood Coven added the solstices and equinoxes to their original calendar, as they desired more frequent celebrations. Their High Priest, Gerald Gardner, was away visiting the Isle of Man at the time, but he did not object when he returned, since they were now more in line with the Neo-druidism of Ross Nichols, a friend of Gardner's and founder of the Order of Bards, Ovates and Druids.[5]
“ No known pre-Christian people celebrated all the eight festivals of the calendar adopted by Wicca. Around the four genuine Gaelic quarter days are now ranged the Midwinter and September feasts of the Anglo-Saxons, the Midsummer celebrations so prominent in folklore and (for symmetry) the vernal equinox, which does not seem to have been commemorated by any ancient northern Europeans.[4]
The quote at the end is a little inaccurate. We do know that both equinoxes were probably celebrated by the ancients, based largely on the astronomical alignments
towards the Equinoctial sunrises/sets in many stone circles throughout Great Britain.
My personal approach is not to exclude a practice if it isn't "authentic", but merely to accept that it's not ancient and practice it anyway. Take handfasting, for example. That's a modern invention, but it's a beautiful practice that I identify strongly with, so I incorporate it into my own practices (my bf and I were handfasted on the holy day of my patron deity, Brigid, on February 2nd). On the other hand, the concept of four elements aligned with the directions that was introduced by Wicca strikes me as silly, so while I am perfectly happy to let other people do it, I personally do not. To me, whether or not something is old is not the deciding factor in "authenticity"; it's whether or not it rings true. And it's perfectly valid to begin new traditions. My family didn't celebrate any holidays until about four years ago, and we've already established new family traditions based around the holidays we now celebrate. But I do like to know the facts about the traditions I am celebrating.