A ‘sprinkling rite’ (which is something distinct from a ‘renewal of baptismal promises’) may take place throughout the Easter season, as per the Roman Missal. In its ‘Appendix II’ (Rite for the blessing and sprinkling of water), the Missal states:
“On Sundays, especially in Easter Time, the blessing and sprinkling of water as a memorial of Baptism may take place from time to time in all churches and chapels, even in Masses anticipated on Saturday evenings.
If this rite is celebrated during Mass, it takes the place of the usual Penitential Act at the beginning of Mass.”
On the other hand, a ‘renewal of baptismal promises’ takes place at the Easter Vigil Mass, and may also take place at Mass on Easter. From the Missal, #72 of the section ‘Sunday of the Resurrection’:
“The Creed is said. However, in Easter Sunday Masses which are celebrated with a congregation, the rite of the renewal of baptismal promises may take place after the Homily, according to the text used at the Easter Vigil. In that case, the Creed is omitted.”