The exception: when a specific feastday falls on a weekday that would, if it were not in lent, deserve a Divine Liturgy, then the Liturgy is celebrated on the calendar day, rather than on the Liturgical day, according to the Typikon of Constantinople. A recent example: 40 Martyrs of Sebaste, who are celebrated March 9. March 9 was a Wednesday (Revised Julian Cal.), which is a day for Presanctified Liturgy. That evening, when we would expect hymns for March 10, we instead were directed to sing hymns for the Martyrs.