Question: what are the major events in christianity?
Answer: Annunciation, 25 March.
The Easter period, in Spring (dates vary): Lent. Holy Week. ... 
Ascension Day (40 days after Easter)
Pentecost (7th Sunday after Easter)
The Christmas period, late November to early January. Advent, the period leading up to Christmas: begins on the Sunday closest to 30 November.