Chazal say (Rosh Hashanah 11A) that we were redeemed in Nissan and we will once again be redeemed in Nissan. Therefore, the night of the Seder is an auspicious time to evoke the geulah.
There is a famous story involving the three great lights of chasidus: the Chozeh of Lublin zy’a, the Yid Hakadosh of Peshischa zy’a, and Rav Yitzchok Isaac of Kaliv zy’a. One year, they decided that on the night of the Seder, each of them would do all they could to bring the geulah. However, when the first night of Pesach arrived, the Chozeh said with his ruach hakodesh, ‘In Peshischa, Rebitzen Shaindel got angry. In Kaliv, the Seder in being conducted in Hungarian. I cannot do it alone.’
It was later discovered that Rebitzen Shaindel, the wife of the Yid Hakadosh, had gotten into an argument with her mother-in-law, the Yid Hakadosh’s mother, about which one of them would sit at the head of the table.
In Kaliv, the daughter of Rav Tzvi Hirsh of Ziditchoiv zy’a was a daughter-in-law of Rav Yitzchok Isaac. Her husband wanted to be by his father for the Seder, but she wanted to be by her father. Her father told her to listen to her husband, so they went to Kaliv.
She noticed that the time for the Seder arrived but her father-in-law was taking a long time to start. He didn’t commence until a wagon pulled up. On the wagon were three landowners and four princesses. The Rebbe spoke with them for a short time in Hungarian and only started the Seder after they left.
After yomtov, she returned to her father’s house. She intended to complain about having to spend Pesach in Kaliv but as soon as she approached him, he said, ‘You merited seeing the three Avos and four Imahos, who came to your father-in-law to explain why the golus was not over yet so that he doesn’t do anything extreme to hasten the redemption!’
The Chozeh saw all of this with his ruach hakodesh and realized that he was left alone in his mission, and he could not do it alone.