In the Roman Catholic Church in England and Wales (at least), the first eight days of the Easter Season make up the Octave of Easter and are celebrated as Solemnities of the Lord according to General Norms for the Liturgical Year and Calendar. http://www.liturgyoffice.org.uk/Calendar/Sunday/EasterWeek1.shtml
As each of those days is a Feast of the first order, fasting is inappropriate.