The Catholic Church is busier in the winter because the four Sundays of Advent leads up to Christmas. There are feastdays within the liturgical calendar for the summer which are just as grand and wonderful e.g. Corpus Christi and Assumption. Whilst those remain to be Holy Days of Obligations within the precepts of the Catholic Church, they do not comprise of long seasons of preparation like Advent. Unless one is particularly aware of the liturgical seasons of the Church, Corpus Christi and Assumption easily slip into the out-of-sight-out-of-mind sort.
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