Baal Shem Tov, or Besht — the founder of Chasidism —
Seventh Night: Shevi`i shel Pesach
The night we celebrate crossing the sea! We like to set pans of water on the floor or outside on the grass and take turns dancing through and jumping over them, with everyone else making two lines for them to pass through and waving scarves and cloth. Sometimes we set bowls of fruit in the path, because there's a midrash that says that the Israelites could reach into the the walls of the sea and get fruit as they crossed.
There’s some wonderful liturgy just for this day, and it’s especially used in the evening service and in the night, when in our story the sea was receding to allow the Israelites to pass.
2) An Italian cycle of additions to the ma`ariv (`arvit) service. I no longer have access to the Hebrew; what I have is a rough translation I did some 20+ years ago. But it’s beautiful to add to your davening on the seventh night. It's in doc format so you can reshape it to your heart's content. Download the doc file here.
ברוך אתה ה' אלהינו מלך העולם שלא חסר בעולמו כלום וברא בו בריות טובות ואילנות טובים להנות בהם בני אדם