Why pick that day? It is because alot of paganism entered the church. We dont know when Jesus birthday is. He never told us to celebrate it--only His death through Communion are we told to keep.
When the church was christianizing, there were pagan feast days and folk still wanted to celebrate them, so they were masked. 12-25 is one of them. weeping for Tammuz 40 days is another one one of them later covered by Lent(Jesus never told us to have Lent.)
Since the day was reckoned evening to morning, the day part after the (Hallowe'en ) is All Saints Day in the Catholic church. What's up with that? Why are we celebrating anyone who has attained heaven? "All Saints and All Souls comprise the two-day celebration of the Communion of Saints – those who are with God in heaven and those who are on their way to heaven. On the Solemnity of All Saints, November 1, the Church celebrates those Christians who achieved spiritual maturity. It is a day to
venerate all the holy men and women who have been canonized by the Church."
What is the significance of All Saints Day? - National Shrine of the Immaculate Conception After that is All Souls Day or dia de Los Muertos.--
To me, Having fall festival at church so kids dont go trick or treating (Church oween) is the same as Halloween--candy, same day trick or treat, --same song same verse, a little bit louder and a little bit worse.