{Peter and John} (Petron kai I(9361)n(886e)).  Mr 14:13  has only
"two" while  Mt 26:17  makes the disciples take the initiative.
The word passover in this context is used either of the meal, the
feast day, the whole period (including the unleavened bread).
"Eat the passover" can refer to the meal as here or to the whole
period of celebration ( Joh 18:28 ).