What you want is not the Catechism or Canon Law, but the ritual text for the Rite of Christian Initiation of Adults. This is where the situation for baptized but uncatechized adults is discussed.
Excerpts from
Preparation of Uncatechized Adults for Confirmation and Eucharist:
- The following pastoral guidelines concern adults who were baptized as infants either as Roman Catholics or as members of another Christian community but did not receive further catechetical formation nor, consequently, the sacraments of confirmation and eucharist. [snip]
- The high point of their entire formation will normally be the Easter Vigil. At that time they will make a profession of the faith in which they were baptized, receive the sacrament of confirmation, and take part in the eucharist. If, because neither the bishop nor another authorized minister is present, confirmation cannot be given at the Easter Vigil it is to be celebrated as soon as possible and, if this can be arranged, during the Easter season.
