It is in the Jewish month of Nissan, which falls out during the spring.
There are no restrictions on what may be worn to a Seder, but it is a joyous celebration, and people usually dress up.
Most of the time is spent prayer.Among the Mizrahi Jewish community, there is a Rosh Hashanah Seder (that is much shorter and simpler than the Passover Seder) where important foods are eaten to symbolize the beginning of the year, such as calf-head/tongue (for the head of the year), apples with honey, hard-boiled eggs, swiss chard, etc.
end of the year celebration means its the last day to spend time with this old year, old life and time to start a new year and a new life.
There is no way to provide a general answer to this question. Everyone views the seder differently and everyone thinks differently. On an emotional level though, the seder is a joyful family celebration of remembering the Exodus and giving thanks to God.
because it is the remembrance of the Israelites struggle and journey to freedom
The seder has evolved over time. Plus, sacrifice cannot be offered without the Temple so no sacrifices are involved in the Passover celebration.
An 150 year celebration is called a Sesquicentennial celebration
A 100 year celebration is called a centennial celebration.
Yes. His Last Supper was at the time of year at which Passover is celebrated.
Some Christian congregations seek to find meaning in the Jewish celebration of Passover by engaging in "seder meals" that try to replicate the Last Supper which, according to some authorities, was a Seder. Whether or not this is true is not the answer to this question. But it does raise the issue of whether or not there needs to be a Christian Seder. Other Christian congregations create their own "talk feast" (the Greek antecedent to the Passover Seder) that usurp Jewish symbols and imbue them with Christian interpretations. This is totally inappropriate, and many Jews feel insulted when they learn of these (ab)uses of their traditions. My answer to this overall question is "no" and here is why. The Seder is a Jewish celebration commemorating an event, legendary or real, in the life of the Jewish people. As such, it would be inappropriate for a Christian denomination to adopt the Seder to any purpose other than understanding their own scriptural roots or their Jewish neighbors. I am not sensitive enough to the need of understanding the Seder in context of the Last Supper; I just don't get the connection myself. But if a Christian congregation wishes to know what the Passover Seder is like in order to get a flavor of the context of biblical times, that would be fine. There is a danger of changing the Jewish Seder into a Christian observance, and this would be wrong. So, no, there would be no need or use for a Christian Seder.
Samhain is the celebration of the light half of the year changing to the dark. It is a sort of new year and it was a feasting day. It was also that this "in between time" was the day for spirits and to celebrate and feast for them. Which means Beltane is the celebration from the dark part of the year to the light, and for the harvest.
At the Seder meal we retell the story of the Exodus from Egypt.