Lots of expositional preachers depart from their normal practice of preaching through books of the Bible around Christmas and Easter, and maybe a few other times of year. I don't intend to dump on that practice, but I want to argue that it's often unnecessary.
In God's king providence, our church's series through Leviticus lined up remarkably well with the calendar over the past few weeks:
12/25: Leviticus 16 (the Day of Atonement). If you can't think of an appropriate way to handle that text on Christmas morning, you probably shouldn't be preaching.
1/1: Leviticus 17 (guilt, blood, life, and cleansing). Maybe a bit of a reach, but it's not too hard to see how some of those themes relate to the first day of a new year.
1/8: Leviticus 18 (laws concerning sexual immorality). I don't see any particular connection between the text and the calendar here. In fact, for awhile it looked like our pastor would land on this text on 12/25. And even I would argue against the prudence of sequential exposition in that event.
1/15: Leviticus 19 (a bit of a grab bag of laws related to holiness, but with a particular emphasis on justice and oppression in relationship to foreigners). And today we remember Martin Luther King's birthday.
1/22: Leviticus 20 (opens with condemnation of child sacrifice to idols). On the 39th anniversary of Roe v. Wade.
Look, I realize that the anti-sovereigntists may argue that this is coincidence, or we just got lucky. But I actually want to suggest that you don't really need texts to line up this neatly in order to make sequential exposition connect with major holidays.
Think for a second about how many holidays relate to freedom, sacrifice, gratitude, and grace. Is it not fairly obvious how each of those themes relates directly to the over-arching message of Scripture? Or even more directly, aren't each of these themes foundational to the gospel?
Let me put all my cards on the table. I think you ought to explain what every text you preach has to do with the gospel and the big story of the Bible. And if you're doing that, it really may not be so difficult to explain to your congregation how just about any text relates to the major cultural observation that everyone has, at the very least, in the back of their minds when they walk in your church's doors.