Did it used to be more than that?
Industrial history in these parts says that the Greek Catholic minors at the Darr Mine in Van Meter, PA were saved from the mine disaster there back in 1907- because they were all absent from work as they were observing the holy day of obligation for St. Nicholas.
In the previous post I said Ascension was Pascha + 50 days, but that is Pentecost. Ascension is Pascha + 40 days (on Thursday).
There are many more, because there are 12 Great Feasts, but not obligatory. The Ukrainian Catholic Church observes more of them.
Byzantine Catholic Great Feasts
Fixed
Sep-8 THE NATIVITY OF THE THEOTOKOS +
Sep-14 THE EXALTATION OF THE HOLY CROSS +
Oct-1 THE PROTECTION OF THE THEOTOKOS AND EVER-VIRGIN MARY
Nov-21 THE ENTRANCE OF THE THEOTOKOS AND EVER-VIRGIN MARY INTO THE TEMPLE +
Dec-25 THE NATIVITY OF OUR LORD, GOD, AND SAVIOR, JESUS CHRIST * +
Jan-1 THE CIRCUMCISON OF OUR LORD, GOD, AND SAVIOR JESUS CHRIST
Jan-6 THE THEOPHANY OF OUR LORD, GOD, AND SAVIOR JESUS CHRIST * +
Feb-2 THE MEETING OF OUR LORD, GOD, AND SAVIOR JESUS CHRIST WITH SIMEON AND ANNA +
Mar-25 THE ANNUNCIATION OF THE THEOTOKOS AND EVER-VIRGIN MARY +
Jun-24 THE NATIVITY OF THE HOLY PROPHET, FORERUNNER, AND BAPTIST JOHN
Jun-29 THE HOLY PRE_EMINENT APOSTLES PETER AND PAUL *
Aug-6 THE TRANSFIGURATION OF OUR LORD, GOD, AND SAVIOR JESUS CHRIST +
Aug-15 THE DORMITION OF THE THEOTOKOS AND EVER-VIRGIN MARY * +
Aug-29 THE COMMEMORATION OF THE BEHEADING OF THE HOLY PROPHET, FORERUNNER, AND BAPTIST JOHN
Variable Great Feasts (of the 12 Great Feasts):
The Sunday before Pascha (Easter)-- the Entry into Jerusalem (Palm Sunday) * +
Forty Days after Pascha (Easter) – the Ascension of Christ (Thursday) * +
Fifty Days after Pascha (Easter) – Pentecost Sunday * +
- Great Feast of the 12 Great Feasts of Christ and Theotokos (9 are fixed dates, only 6 are mandatory, with up to 4 mandatory on non-Sunday)