This Shabbat is known as "The Great Shabbat" ("Shabbat HaGadol" in Hebrew) — see the 1st (straight from the Warsaw ghetto!) 2nd and 7th articles.
The 3rd article is on the once-a-year blessing over budding/blossoming fruit trees (this can be a nice family activity during the weekdays of the festival, if you haven't recited it yet).
The mitzvah of Mikveh first appears in this week's Reading. Article #4 discusses a mystical aspect of this topic crucial to Judaism.
Next week: special PASSOVER issue.