We are required to eat two meals on Jewish festivals, each preceded by kiddush, one in the evening and one in the morning. For both meals for each Jewish festival day (and all three meals on Shabbat), say ha'motzi over two complete loaves of bread, each of which is at least 1.3 fl. oz. in volume. 

Source of Saying Jewish Festival Kiddush
Some kiddushes are commanded by the Torah (d'oraita); the others are from Chazal (d'rabanan), as follows:
Kiddush d'Oraita

• First night of Jewish festivals
• Night of seventh day of Passover
• Night of Shmini Atzeret.

Kiddush d'Rabanan

• First day of Jewish festival
• Second night of Jewish festival
• Second day of Jewish festival
• Seventh day of Passover
• Eighth night of Passover
• Eighth day of Passover
• Shmini Atzeret day
• Night and day of Simchat Torah.

Source of Jewish Festival Kiddush Location
Saying Jewish festival kiddush at the place where you will eat your meal is a rabbinical (d'rabanan) enactment.
Jewish Festival Kiddush-Meal Quantities: Evening

• For evening kiddush for a first-night (d'oraita) Jewish festival, a minimum of 4 fl. oz. (119 ml) of wine must be blessed on and at least half must be drunk.
• For evening kiddush for a second-night (d'rabanan) Jewish festival, a minimum of 3.3 fl. oz. (99 ml) of wine must be blessed on and at least 2.0 fl. oz. must be drunk.
• For the evening meal, as on the first two Shabbat meals and for all required Jewish festival meals, a minimum of 1.9 fl. oz. (56 ml) of bread must be eaten within four minutes.

Eating Requirements for Jewish Festival Morning Kiddush
There are two separate eating requirements during the daytime. They may be combined (say/hear kiddush and start the main meal right away) but are often done separately (say/hear kiddush and then eat some light foods and beverages; the main meal is eaten later in the day).
Note Since eating and drinking requirements on all morning kiddushes (both Shabbat and Jewish festivals) are d'rabanan, the required beverage amount for morning kiddush is only 3.3 fl. oz. (99 ml) instead of the d'oraita 4 fl. oz. (119 ml) (which is required for kiddushes for Shabbat evening and all first-night Jewish festivals).

• Morning kiddush requires a halachically legal “meal” with these elements:
  • Blessing on a minimum of 3.3 fl. oz. (99 ml) of wine (or other beverage),
  • Someone's drinking at least half the beverage, followed by
  • Eating at least 1.3 fl. oz. (39 ml, or 1/6 cup) of some type of mezonot within four minutes. 
    Note If you drink at least 3.3 fl. oz. (99 ml) of wine within 30 seconds, you do not need to eat mezonot.
    Note You do not need to drink the wine or other kiddush beverage to fulfill “establishing a meal.” You may hear kiddush and then simply eat the required amount of bread or mezonot. This applies to Shabbat or Jewish festivals, evening or morning.
     

 

• The real meal (kovei'a se'uda) requires eating at least 1.9 fl. oz. (56 ml) of bread (or matza during Passover!) within four minutes. It must include enough food to satiate. 
  Note You can simultaneously fulfill the requirement to “establish a meal” and to “eat a meal” by eating one (the same) piece of bread.

You may directly instruct or ask a non-Jew to do melacha d'rabanan for you on Shabbat, but only:

• To prevent a large financial loss.
  Note A large loss is subjective to the individual's actual wealth and also to that person's perception of what is a large loss. Consult a rabbi.
• For Shabbat needs.
  Example You may ask a non-Jew to unlock an electric hotel door or trigger an entrance door on Shabbat, since this is for a Shabbat need and the action is not prohibited d'oraita.
  Situation A new guest arrives and you need the space on the table occupied by your Shabbat candlesticks.
  What To Do You may not move the candlesticks, but you may ask a non-Jew to do so.
  Situation You left a non-muktza item that you now need for Shabbat on a tree branch (or a child left one in a tree house!).
  What To Do You may not climb the tree to retrieve the item, but you may ask a non-Jew to retrieve it. Example You may ask a non-Jew to turn on air conditioning.
  ExampleYou may ask a non-Jew (directly, no need to hint) to turn off a light if it interferes with someone's sleeping.

  • To allow doing a mitzva.
  • For other pressing (and certainly for life-threatening) needs, such as health, even if the person not sick.

  Note All of these are d'rabanan cases!

An onen who accompanies a body to a foreign country for burial may have two extra days (or more) of onenut. If the onen then returns home and joins other mourners in the shiv'a house, the onen may end shiv'a with the other family members. (For more details, see When Shiv'a (and Shloshim) Starts: Normal Days .)

An onen is prohibited from doing positive mitzvot so as not to be distracted from taking care of the dead body.
An onen may not:

• Do any positive commandment (no blessings, prayers, shema…).
• Eat meat or drink wine (until after the burial).
• Work or operate a business.

Some communities have the custom of an onen's saying kaddish.
NOTE When a person's parent dies on or just before (erev) Shabbat or a Jewish festival, a daughter of any age should not be told until after Shabbat or the festival is over. A son should only be told if he is 6 years old and above and the custom in that community is to say kaddish as an onen.

An onen ends shiv'a (and shloshim) with the household head ("gadol ha'bayit"--whoever controls the money in that household)—even if the household head begins shiv'a before burial and the onen joins the shiv'a house after burial.

If you do not hear about someone's death for 30 days after the person died, observe just one day of shiv'a. If you hear in less than 30 days, observe the regular seven-day shiv'a.

From the time of death until burial, the seven relatives are called onen (onenim). One is only an onen if he or she will participate in the funeral or make decisions related to the funeral. This could be even if you will be involved only in deciding who will speak at the hesped. If someone is completely uninvolved in the funeral arrangements, one is an aveil.

One is not an onen whenever a body may not be buried, such as on Shabbat and Jewish festivals, and so there is no onenut on Shabbat or Jewish festivals. An onen says blessings and does mitzvot on those days.

Shiv'a (and shloshim) starts for a mourner who:

• Attends funeral:  After the burial.
• Will not attend funeral and is a(n):
  • Non-Onen:  Immediately upon hearing news of the death.
  • Onen:  As soon as the onen has nothing (more) to do with the funeral.