Question
What occurs on the last 2 days of the Passover festival?
Answer
The last two days are observed as a standard Festival, with extended prayer services and 2 festive meals each day. Tradition tells us that the end of Passover is a commemoration of the splitting of the sea which occurred on that date.
See this article from our Torah.org site on the subject.
All the Best,
Rabbi Mordechai Dixler