Good Friday
This is the Friday immediately preceding Easter Sunday, traditionally observed as the day Jesus was crucified, bearing our sin so that all who believe and accept His substitutionary sacrifice are exempt of the penalty. While the suffering Christ was subject to was not good, the results are very good for us for “While we were still sinners, Christ died for us…The righteous for the unrighteous, to bring you to God” (Rom 5:8; 1 Pet 3:18). Rather than just a once-a-year honouring a certain day we are to regularly observe Lord's Supper (which is often termed communion), and be continually grateful for what it signifies (1 Cor 11:24-26). The death of Christ on the cross, along with His bodily resurrection, is the paramount event of the Christian faith.
See also: communion, crucifixion, Easter, resurrection, substitution.