What Pilgrim just said is pretty much what I was thinking about the matter.

Not sure what your point is in bringing Hebrews 10:25 into the conversation. This particular verse in context is probably talking about Lord's Day worship services. However, getting together to build one another up in the faith and learning is surely a good practice outside of the regular Sunday services. My pastor for example teaches a hermeneutics course for the men of the congregation every second Saturday morning. He does so, in the hopes it will help the men to wash their wives in the water of the Word better (Eph. 5:25-33).
We also meet for family Bible studies that are elder lead; usually on a book of the Bible. Or as a continuation of the text of Scripture my pastor preached on the previous Sunday service.

I believe a pastor should make it clear (as my pastor does) that December 25th is not the actual date of Jesus birth. Nor is it mandated in Scripture that we need to use that date to celebrate his birth.
One of the things I have noticed is that Christmas and Easter and perhaps weddings seem to be the only times non-Christians go to Church. I realize that we must not fall into the trap in making a worship service geared towards non-Christians, because worship services are for believers worshipping God in spirit and in truth. However, the fact that the Gospel is being proclaimed; may be the avenue God uses to reach those who are elect.

Tom