The seventh day of Passover is not the second Passover, as most Israelis call it. Second Passover happens one month after Passover, to allow people, who lived at the time the temples existed and couldn't go to the temple on Passover to make the Passover sacrifice, to go to the temple and make the Passover sacrifice.
In The 10 plagues part 2 (2021), Riki wanted to say something before the Hassons continue to the second part of the Seder (after the meal) and they (the Rosens) leave. However, the Rosens are seen singing parts of the second part of the Seder.