Dought & clear - , Attending the festivals of the mushrikeen and congratulating them

Is it permissible to attend the celebrations of Christian festivals
and congratulate them?
Praise be to Allaah.
Ibn al-Qayyim (may Allaah have mercy on him) said: it is not
permissible for the Muslims to attend the festivals of the mushrikeen,
according to the consensus of the scholars whose words carry weight.
The fuqaha' who follow the four schools of thought have stated this
clearly in their books… Al-Bayhaqi narrated with a saheeh isnaad from
'Umar ibn al-Khattaab that he said: "Do not enter upon the mushrikeen
in their churches on the day of their festival, for divine wrath is
descending upon them." And 'Umar also said: "Avoid the enemies of
Allaah on their festivals." Al-Bayhaqi narrated with a jayyid isnaad
from 'Abd-Allaah ibn 'Amr that he said: "Whoever settles in the land
of the non-Arabs and celebrates their newyear and festival and
imitates them until he dies in that state, will be gathered with them
on the Day of Resurrection."(Ahkaam Ahl al-Dhimmah, 1/723-724).
With regard to congratulating them on their festivals