Many people, non-christians and christians alike still practice traditional feasts because they believe that passing down their culture to the younger generations will keep them connected to the history of their ancestors.
Yes
If the feasts do not commemorate the ways of the Lord and still celebrate pagans feast, then it is sinful.
No
Celebration of feasts are part of people’s lives and to preserve their own traditions and culture and passed down to their decendants.