This year the Marianists who gather will celebrate the rite called the Mandatum (from the Latin referring to the new command, the mandate Jesus gives his disciples that they should love one another.)
Following the Mandatum is the liturgy of the Eucharist. Enough bread will be consecrated to provide communion for tomorrow's liturgy because the Eucharist is not celebrated on Good Friday.
After Christ's supper with His disciples on the night before He died, they went to the Garden of Gethsemane where the Lord asked his friends to be with Him in prayer.