Present won't exist if past did not happen. We do celebrate feasts every year. One is The All Saints Day. But how and why it started? That's for us to find out.
I searched for the answer to that question and this article is the most comprehensive and simplest form to read.
All Saints' Day (also called All Hallows or Hallowmas), often shortened to All Saints, is a feast celebrated on November 1 in Western Christianity, and on the first Sunday after Pentecost in Eastern Christianity in honour of all the saints, known and unknown. In terms of Roman Catholic theology, the feast commemorates all those who have attained the beatific vision in heaven, while the next day, All Souls' Day, commemorates the departed faithful who have not yet been purified and reached heaven.WIKI