The term ‘Good Friday’ doesn’t appear in the Bible.
It is a commemoration invented by an apostate Church of the day that Jesus Christ was condemned to death and crucified.
The original day was the 14th Nisan, the day beginning the Jewish Passover (the 15th begins at sundown on the 14th). The Jewish Calendar is lunar, which means that the 14th Nisan falls on different days – it is not restricted to Friday.
The Christian calendar was detached from the Jewish Calendar at the council of Nicea 325AD
The date of Good Friday varies from one year to the next on both the Gregorian and Julian calendars. Eastern and Western Christianity disagree over the computation of the date of Easter and therefore of Good Friday.
There is no commandment found in the New Testament to celebrate ‘Good Friday’.
The only observance imposed on Christians is to share bread and wine ‘often’ in remembrance of Christ’s sacrifice.
All other church observances are ‘the commandments of men’ and have no place in genuine Christianity.
I hope you find this helpful.