This is taken from the Catholic CatechismL
Even in communal celebrations, it requires individual absolution!
1482 The sacrament of Penance can also take place in the framework of a communal celebration in which we prepare ourselves together for confession and give thanks together for the forgiveness received. Here, the personal confession of sins and individual absolution are inserted into a liturgy of the word of God with readings and a homily, an examination of conscience conducted in common, a communal request for forgiveness, the Our Father and a thanksgiving in common. This communal celebration expresses more clearly the ecclesial character of penance. However, regardless of its manner of celebration the sacrament of Penance is always, by its very nature, a liturgical action, and therefore an ecclesial and public action. [Cf. SC 26-27] 1140]
1483 In case of grave necessity recourse may be had to a communal celebration of reconciliation with general confession and general absolution. Grave necessity of this sort can arise when there is imminent danger of death without sufficient time for the priest or priests to hear each penitent’s confession. Grave necessity can also exist when, given the number of penitents, there are not enough confessors to hear individual confessions properly in a reasonable time, so that the penitents through no fault of their own would be deprived of sacramental grace or Holy Communion for a long time. In this case, for the absolution to be valid the faithful must have the intention of individually confessing their grave sins in the time required. [Cf. CIC, can. 962 §1] The diocesan bishop is the judge of whether or not the conditions required for general absolution exist. [Cf. CIC, can. 961 § 2] A large gathering of the faithful on the occasion of major feasts or pilgrimages does not constitute a case of grave necessity. [Cf. CIC, can. 961 § 1] 1401]
1484 “Individual, integral confession and absolution remain the only ordinary way for the faithful to reconcile themselves with God and the Church, unless physical or moral impossibility excuses from this kind of confession.” [OP 31] There are profound reasons for this. Christ is at work in each of the sacraments. He personally addresses every sinner: “My son, your sins are forgiven.” [Mk 2:5] He is the physician tending each one of the sick who need him to cure them. [Cf. Mk 2:17] He raises them up and reintegrates them into fraternal communion. Personal confession is thus the form most expressive of reconciliation with God and with the Church. 878]