I have been informed, this morning, from two different sources, that the original Shabbat Hagadol was the Shabbat on the 10th of Nissan when the Children of Israel were preparing for the Exodus. They were commanded to take a lamb on the 10th of Nissan and keep it for 4 days, and then slaughter it as the sacrifice. The 10th was on Shabbat. A write up includes the following statement
Commenting on the greatness of the day, the Halacha Yomi from Dirshu writes, (discussing the role of "eved", slave and not following the statement that "slavery" ended on Rosh Hashana)
Slaves cannot possibly possess anything of their own since immediately upon acquisition of anything, the owner takes possession. On Rosh Chodesh Nissan Hashem commanded that on the upcoming tenth day of the month each man should acquire a lamb for his household. In effect, this mitzvah was to restore their humanity and liberty that was denied to them their entire lives. Acquiring a lamb was to grant them the rights and ability to possess their own personal property.
Wouldn't this process call for a few actions which are violations of Sabbath rules? The chabad site includes the statement
The Egyptians were aware that the Children of Israel observed Shabbat and did not busy themselves tending animals on that day, so when the Egyptians saw them taking lambs and binding them to their bedposts on Shabbat, they were surprised and decided to investigate what was happening.
Between selecting and singling out one animal (maybe a form of borer?), to acquiring, to hachana, preparing for something after the Sabbath, this all seems to demand violating a variety of prohibitions (whether or not they are slaves). Were the laws of melacha on Shabbat suspended (or temporarily superseded) for this Shabbat and if so, in toto or just in selected categories?