Finally, the New Testament!

Here are the scriptures I have found pertinent to this discussion. I am just going to give links today, as there is a lot of text.

Romans 14 thru 15:2 Romans 14 and 15

1 Corinthians 8:4-13 1 Corinthians 8

1 Corinthians 10:14-21 and verse 31 1 Corinthians 10

Galatians 4:8-11  Galatians 4

Colossians 2:16-17 Colossians 2


As for discussion, I could heavily cut and paste, or just link you to a sermon. John Piper puts this more succinctly and clearly than I could, and he provides a good summation of these ideas.
 Sermon, text and video here

I found nothing in the major commentaries which concluded anything other than we are free to observe or to not observe special days. We must do what we do in faith and good conscience, and we may not pass judgment on, or create a stumbling block for, those who observe otherwise. As seen through out  scripture we are to give regard for the other, and especially protecting the weaker. The bottom line is...

I am to pray and move forth in faith.
You are to pray and move forth in faith.
With Christ as Lord, the Holy Spirit will guide our actions.
Glory to God alone is our aim, yet, He will get the glory PERIOD.

"Therefore, I do not say to you, “Lighten up.” Or, “Don’t sweat the small stuff.” Rather I say, “Stand in awe of the risen Christ who will get his glory from the living and from the dead and from the eaters and the abstainers and from the day-keepers and the non-day-keepers. Stand in awe of Jesus Christ. And whatever you do, whether you eat or whether you drink, do all to the glory of Christ" 1 Corinthians 10:31 So, whether you eat or drink, or whatever you do, do all to the glory of God. 
(John Piper from the above linked sermon)