Leviticus 23 contains all the appointed times starting with the most frequent, the weekly Sabbath. Then there are annual days primarily set by the day of the month. The two exceptions are first fruits and weeks. Each of these follow a weekly Sabbath. The first follows the first Sabbath after Passover; the second follows the seventh Sabbath. Many of the annual days are also days of no work and could be considered like a Sabbath. Some are actually called a Sabbath:
Speak unto the children of Israel, saying, In the seventh month, in the first day of the month, shall ye have a sabbath, a memorial of blowing of trumpets, an holy convocation. (Leviticus 23:24 KJV)
Day of Atonement is also a Sabbath:
It shall be unto you a sabbath of rest, and ye shall afflict your souls: in the ninth day of the month at even, from even unto even, shall ye celebrate your sabbath. (Leviticus 23:32 KJV)
The seventh month begins with a 10-day period which will include at least one weekly Sabbath. Therefore in that week there will be Sabbaths (one weekly and one annual).
The pattern of plural and singular use of Sabbath continues in the New Testament. The Englishman's Concordance lists 68 occurrences of Sabbath - 25 are plural and 43 singular. Many of the plural uses make sense when considered as speaking to the weekly Sabbath. For example:
And he came to Nazareth, where he had been brought up: and, as his custom was, he went into the synagogue on the Sabbath(s) day, and stood up for to read. (Luke 4:16 KJV)
Some plural uses cannot mean weekly Sabbaths:
Now upon the first day of the week (sabbaton), very early in the morning, they came unto the sepulchre, bringing the spices which they had prepared, and certain others with them. (Luke 24:1 KJV)
The plural form of Sabbath is translated as "the first day of the week". The actual language is "They came to the tomb very early morning Sabbaths..." Since the resurrection took place following a period of 3-days and 3-nights, only one Sabbath could be weekly. The translations are not wrong in that the correct day of the week is rendered (Sunday, the day after the Sabbath). What has happened is that the calendar before the resurrection has become obscured. The only way to get more than one Sabbath into a 3-day period of time is to include an annual day. Luke understood the first day of Unleavened Bread as a "Sabbath" since it was a day of no work. In other words, the resurrection occurred on Sunday after the Sabbaths of the first day of Unleavened Bread and the weekly Sabbath.
Luke is not alone in using the plural form of Sabbath when describing the resurrection. It is one of those aspects of the Gospel which is found in all four accounts: Mark 16:2, Matthew 28:1 (twice), Luke 24:1, and John 20:1 and 20:19. Since the plural was used in all four accounts and since the weekly Sabbaths are 7 days apart and since Jesus was in the tomb 3 days, the second Sabbath must be the first day of Unleavened Bread.