Answer:
The premiere was in Dublin, 13 April 1742, at the "Great Musick Hall" in Fishamble Street. Handel spent the entire winter concert season in Dublin at the invitation of the Lord Lieutenant of Ireland, William Cavendish, 4th Duke of Devonshire.
The London premiere was 23 March 1743. Though Messiah is today often associated with Christmas, in Handel's day it was customary to perform oratorios during Lent, when opera and other secular amusements were supposed to be avoided.
The London premiere was 23 March 1743. Though Messiah is today often associated with Christmas, in Handel's day it was customary to perform oratorios during Lent, when opera and other secular amusements were supposed to be avoided.