<KD>
The first day of Unleavened is not a Sabbath day if you read the text carefully.
Leviticus 23:3
For six days work may be done, but on the seventh day there is a sabbath of complete rest, a holy convocation. You shall not do any work.
We know the 'seventh day' is a Sabbath day and importantly a day of 'complete rest'.
Here is where you need to read carefully.
Leviticus 23:7
On the first day you shall have a holy convocation, you shall not do any laborious work.
The first day of Unleavened Bread is not a day of 'complete rest' and is also not the 'seventh day'. The verse above simply says not to do any 'laborious work'.
Leviticus 23:8
On the seventh day is a holy convocation, you shall not do any laborious work.
Same goes for the seventh day of the week of Unleavened Bread. Light work can be performed on the first and the seventh days of Unleavened Bread. No mention of 'complete rest' or 'Sabbath day'.<KD>
They will not listen, or in this case read and comprehend. They have their assumptions/presuppositions and are compelled to interpret scriptures to fit those assumptions/presuppositions.
Here is another verse which states it more specifically.
Exodus 12:15-16
(15) Seven days shall ye eat unleavened bread; even the first day ye shall put away leaven out of your houses: for whosoever eateth leavened bread from the first day until the seventh day, that soul shall be cut off from Israel.
(16) And in the first day there shall be an holy convocation, and in the seventh day there shall be an holy convocation to you; no manner of work shall be done in them, save that which every man must eat, that only may be done of you.
The 1st and 7th days of Unleavened bread are holy convocations. They are never called a Sabbath anywhere in the OT. All work is prohibited on the Sabbath.
On 1st/7th ULB the preparing and cooking of food is specifically permitted.
Since the Passover/ULB is the only other event which occurs in Passion week, ULB does not have a Sabbath, there cannot be 2 Sabbaths in Passion week.