A thought from the Chozeh of Lublin:
The parshiyos of Bo, Beshalach, Yisro, Mishpatim, Terumah, Tetzave and Ki Sisa, all contain within them different Yomim Tovim. If you make the effort, you can experience the aura and inspiration of that particular yom tov during these coming weeks.
Parsha Bo has the story of the Exodus from Egypt which corresponds to Pesach.
Parshas Beshalach has the Splitting of the Sea which happened on Shvii shel Pesach (the 7th of Pesach).
Parshas Yisro, has the Ten Commandments, corresponding to Shavuos.
Parshas Mishpatim, which has numerous laws, dinim, corresponds to the Yom HaDin and Yimei HaDin, Rosh Hashana and Yom Kippur
Parshas Terumah has instructions for the building of the Mishkan and with it came the cloud that hovered above it, which corresponds to Succos.
Parshas Tetzave has the lighting of the menorah which corresponds to Chanukah.
Parshas Ki Sisa which has the mitzva of giving the machatzis ha'shekel corresponds to the month of Adar when the half shekels began to be collected.
Another version or point to the vort, cited in the name of the Spinka Rebbe, is that the weeks of these parshiyos with yetzias Mitzrayim, kerias Yam Suf, and Mattan Torah, are more spiritually potent than the actual yomim tovim of Pesach, Shevii shel Pesach, and Shavuos!
This is because the parshiyos contain the the koach (power, spiritual strength) of Torah while the yomim tovim are the koach of zeman (the time of year that they fall).