Feasts

The principal Feasts which are to be observed in the Church of England are:

Christmas Day
Epiphany
the Annuniation of the Blessed Virgin Mary
Easter Day
Ascension Day
Whitsunday or Pentecost
Trinity Sunday
All Saints' Day

(Canon B6.2)

The Holy Communion shall be celebrated in every parish church at least on all Sundays and principal Feast Days, and on Ash Wednesday and Maundy Thursday.

(Canon B14)

Worth knowing

Before, God-willing, I become an Incumbent, I think I might re-read The Canons of the Church of England. There's lots of interesting useful stuff worth knowing. For example, B20.2 Of the musicians and music of the Church is quite helpful:

Where there is an organist, choirmaster or director of music the minister shall pay due heed to his advice and assistance in the choosing of chants, hymns, anthems, and other settings, and in the ordering of the music of the church; but at all times the final responsibility and decision in these matters rests with the minister.