OT feasts in the OT Law ... to still be kept today?
In light of the teaching in Hebrews (e.g. Heb 8:25 or Heb 10:1) as well as teaching in Pauline epistles (cp Gal), I would like some input on practice and teaching of some groups who teach more or less extensively that Christians today should be keeping the various OT feasts in some kind of remembrance and consideration of the Jewish roots of Christendom.
Asking a bit bluntly: Are Christians in New Covenant age still under the Old Covenant instructions? What about keeping those feasts? Also, are those folks even keeping the feasts, seeing that they do not travel to Jerusalem and that there is no temple there where to keep various prescribed rituals?