When did the Catholic Church start having Mass on Saturdays? Did it begin in large churches before smaller churches? I think it was in the 1970s. I tried googling it but I did not have luck. I came upon this site through google!
Pope Pius XII set up a Pontifical Commission for the Reform of the Liturgy in 1948 and was the first to permit Mass to be celebrated during the evening hours.
*Chrisus Dominus * Pope Pius XII issued on January 6, 1953:Rule VI. If the circumstance calls for it as necessary, We grant to the local Ordinaries the right to permit the celebration of Mass in the evening, as we said, but in such wise that the Mass shall not begin before four o’clock in the afternoon, on holy days of obligation still observed, on those which formerly were observed, on the first Friday of every month, and also on those days on which solemn celebrations are held with a large attendance, and also, in addition to these days, on one day a week; with the requirement that the priest observe a fast of three hours from solid food and alcoholic beverages, and of one hour from non-alcoholic beverages. At these Masses the faithful may approach the Holy Table, observing the same rule as regards the Eucharistic fast, the presumption of Canon 857 remaining in force.
papalencyclicals.net/Pius12/P12CHDOM.HTM
Some were allowed to fulfill obligation for the next day, from Eucharisticum Mysterium, of May 25, 1967:28. Anticipating the Sunday and Feast Day Masses on the Previous Evening
Where permission has been granted by the Apostolic See to fulfill the Sunday obligation on the preceding Saturday evening, pastors should explain the meaning of this permission carefully to the faithful and should ensure that the significance of Sunday is not thereby obscured. The purpose of this concession is in fact to enable the Christians of today to celebrate more easily the day of the resurrection of the Lord.
All concessions and contrary customs notwithstanding, when celebrated on Saturday this Mass may be celebrated only in the evening, at times determined by the local Ordinary.
adoremus.org/eucharisticummysterium.html