Passover

The shank bone, typically displayed on the seder plate during Pesach or Passover, symbolized the sacrificial lamb. The blood from the lamb was supposedly used to paint the door and window frames of Jewish households to identify them to the angel of death when it slew the firstborn sons of the Egyptians, so that it would "pass over" those houses and spare the Jewish children.

so they could perify their spirits and soul

There is a "script" for the Passover Seder, called a Haggadah. Actually, there are many versions of this script, but all include expanded blessings over the meal, and a ceremony involving a ritual meal including matzoh, bitter herbs (usually horseradish in the United States), a burnt lamb bone (which, of course, is not eaten!), haroset (an apple and nut mixture -- there are all sorts of recipes for this), and greens dipped in saltwater. Four glasses of ritual wine are also served. In the traditional service, a prayer is offered for the restoration of the Temple in Jerusalem.

The story is much too long to relate here on WikiAnswers. A brief summary doesn't do the job, and the important details would fill a few screens. The best way to get the straight, authentic story, including most of the important details, in an easily readable form, is to take a little bit of time and read it in the Bible. Start at the beginning of the book of Exodus, and you'll have an answer ... complete enough to be satisfying ... in a single evening's read.

There is no set time for how long a sedar meal is. A Sedar has many parts. Before the actual meal, there is the retelling of story of the exodus of the Jews from Egypt. Because of traditional prayers and readings, as well as lively discussion, this can take up to 1 hour; and that's before anyone eats. The meal itself has some customary servings. 1st eggs in salt water, gefilte fish, chicken soup, and then the main course. After dinner, there are normally plenty of deserts and then the last part of the Sedar; grace after meals. In this case, the B'rkot (grace after meals) includes, not just prayers and readings, by many joyous songs. It is not unusual for the whole Seder to take 4-5 hours.

Matzoh which is unleavened bread.

On the first night you light 1, then you add 1 each night ultimately lighting 8 on the final evening. Each night, an extra helper-candle is used to light the others and then it also remains lit.

You need a total of 44 candles.

The roasted egg is symbolic of one of the two sacrifices offered during Passover when the Temple stood.

Generally it occurs only during Passover, a Jewish holiday. There is also a seder for the holiday of Tu Bishvat, but this seder is rarely observed.

It is on the 15th of Nissan, the first Hebrew month. The Jewish calender is based on the moon, but extra months are added so that over a period of 19 years, the cycles meet up, in a way. The months are based on the moon, but an extra month is added some years to keep the calender in sync with the seasons.

There are kosher brands of condensed milk, to be used during Passover, it would have to be certified kosher for Passover.

In regard to sweetened condensed milk, most use corn syrup which is kitniyot. There are substitute recipes for this product though.

A passover seder is a religious event and you would normally wear the same type of clothing that would be worn to the synagogue or at a sabbath meal.

Guests who are not familiar with religious customs can wear any nice outfit (maybe with a sport jacket), though tee shirts, jeans, tank tops, tight shorts and outfits with decolletage are not appropriate in religious circles and will result in polite stares until others at the table get used to the fact that you are really a nice person.

The first sacrifice for Paysach (Passover) was the year that the Jews left Egypt.

Passover is about how the Jews were slaves in Egypt but Moses led them out and they were liberated. It is a story of survival and draws Jews together as it is part of the common Jewish memory. The Jews have been persecuted against many times, and this one example of their ability to overcome hate.

The first night of Passover is the Seder night. During the Seder-meal, there are a number of symbolic foods on the table. One of them is a roasted lamb or goat shank-bone, chicken wing, or chicken neck; symbolizing the korban Pesach (Passover sacrifice), which was a lamb that was offered in the Temple in Jerusalem, then roasted and eaten as part of the meal on Seder night.

Yes, only if they are specifically certified kosher for passover. You can find kosher for Passover olives at any Jewish supermarket

7 days in the Land of Israel, 8 days in the Diaspora.

Perogie dough is made with raw flour and therefore is chametz. They cannot be eaten during Passover.

Jews commemorate passover by holding a dinner ritual called a seder, in which we tell the story of the the exodus from Egypt, and eat certain symbolic foods. The seder also includes insight from 2nd century Rabbis.

During the 8 days of Passover (7 days for Israel and Reform Jews), no regular breads or grains are eaten, except for Matzah, which is a flat, unleavened bread eaten by our ancestors who were fleeing Egypt.

Passover celebrates the end of the slavery of the Israelites and it is therefore also called "The festival of freedom".

Jews prepare for Pesach (Passover) by cleaning the home and removing all leavening (bread, cakes, cookies, pasta, and some other things). Kosher-for-Passover foods are bought, including unleavened bread called Matzoh.