Today is the sixth day of the Easter Octave. This means that, even though it’s Friday, there is no requirement for penance.
So keep feasting!
The reason for this is pretty straightforward: Penance is usually required on Fridays, but not when that Friday is a Solemnity. Each day of the Octave of Easter (Easter plus the next 7 days) is a Solemnity. Therefore, there is no penance required for Easter Friday.
So keep on celebrating the Resurrection of Our Lord Jesus Christ, and feast away!