Days of Penance Can. 1251 Abstinence from meat, or from some other food as determined by the Episcopal Conference, is to be observed on all Fridays, unless a solemnity should fall on a Friday. Abstinence and fasting are to be observed on Ash Wednesday and Good Friday.
Can. 1246 §1. Sunday, on which by apostolic tradition the paschal mystery is celebrated, must be observed in the universal Church as the primordial holy day of obligation. The following days must also be observed: the Nativity of our Lord Jesus Christ, the Epiphany, the Ascension, the Body and Blood of Christ, Holy Mary the Mother of God, her Immaculate Conception, her Assumption, Saint Joseph, Saint Peter and Saint Paul the Apostles, and All Saints.
I don’t see anything in Canon law about Friday in the Easter Octave not being a normal day of penance re abstinence.
Can. 1253 The conference of bishops can determine more precisely the observance of fast and abstinence as well as substitute other forms of penance, especially works of charity and exercises of piety, in whole or in part, for abstinence and fast.
There is also the USCCB’s 2001 Penitential Practices for Today’s Catholics “…a brief summary of the Church’s discipline with regard to penitential practices…” and their 1966 “Pastoral Statement on Penance and Abstinence”
In our Eastern Catholic calendar this week, Bright Week, is no fasting all week. Typically every Wednesday and every Friday is a day of abstinence and fasting for us.