During Lent, in the Eastern Church (both Catholic and Orthodox), priests consecrate the Eucharist only on Sundays and feast days. Throughout the year, daily liturgies are less common in the Eastern Church than they are in the Western Church, but in Lent, any daily liturgies (again, outside of feast days) take the form of the Liturgy of the Presanctified.
“Presanctified” refers to the previously consecrated bread, reserved from the Sunday liturgy. The faithful gather for a liturgy that is similar to a standard one, but without a consecration, and when the time comes for the distribution of holy Communion, the reserved body of Christ is distributed to the faithful.
In the distant past, the Roman rite practiced something similar during Lent, but today, the last remaining vestige of this practice in the Western Church is the Good Friday liturgy.