These were usually local festivals, though the martyrdom of some of the apostles were more widely celebrated. Pope Gregory III (731-741AD) decided to have one day a year in the church calendar to celebrate all the martyrs or saints, instead of lots of different regional saint's days, and this was set as the 1st of November, and known as the "Feast of All Saints" or "All Saint's Day" or "All Hallows Day" ("hallow" is an old English word for saint or holy person).

richmondparkchurch.org.uk an evangelical pentecostal church in Boscombe, Bournemouth, Dorset, UK.