In Islam, there are some ceremonies and occasions which are held all around the world among Muslims. They all have religious backgrounds and are mostly referred to in the holy Quran. Muslim nations have been commemorating them in the course of history. Here we are going to have a glance at the most significant Islamic occasions based on the Lunar Calendar.

6 Major  Islamic Occasions 

1.10th of Muharram: Martyrdom of Imam Hussain (AS)

The month of Muharram is the first month of the year in the lunar calendar. On the tenth day of this month, Hussain Ibn Ali (AS), the grandson of Prophet Muhammad (PBUH&HP), and his companions were brutally martyred, and their women and children were taken captive by the caliph of the time, Yazid ibn. Muawyah. Their story has been the source of inspiration for many new converts. 

2. 20th of Safar: The Day of Arbaeen

Arbaeen is the Arabic word for forty, and it marks the 20th of Safar, the fortieth day after Imam Hussain's (AS) martyrdom on the day of Ashura, who was martyred in the event of Karbala along with his companions in the cruelest and most inhumane way possible. 

According to some historical accounts [2], some of the members of Imam Hussain's (AS) family after being released from the bondage of Yazid's forces returned to Karbala from Sham (today's Damascus) to visit Imam Hussain's (AS) grave. Also, some believe that Imam Hussain's (AS) head, which was taken to Sham by Yazid's army was brought back to Karbala on this day and buried with his body [3] & [4]. 

Every year, a few days before this day, a vast number of people from all over the world, Muslims or even non-Muslims, gather in Iraq to take part in a symbolic walk, to revive the teachings of Imam Hussain (AS) and commemorate his sacrifice in the way of Allah and humanity. 

3. 17th of Rabi al-Avval: Prophet Muhammad's (PBUH&HP) Birthday

There is a disagreement concerning the exact date of Prophet Muhammad's (PBUH&HP) birthday. Some believe it occurred on the 12th of Rabi al-Avval, while others consider it to be on the 17th of Rabi al-Avval, the third month in the Islamic calendar. Prophet Muhammad (PBUH&HP) was born in Mecca. All Muslims around the world celebrate his birthday and regard it as one of the important Islamic occasions. On this day, Muslims feed the needy, pray and recite the Quran, commemorate Prophet Muhammad (PBUH&HP), and his challenges to deliver the messages of Allah to human beings.

4. 1st of Shawwal: Eid al-Fitr

The first day of the month of Shawwal, the tenth month of the Islamic calendar, is called Eid al-Fitr. After fasting for one month, during the month of Ramadan, remembering, worshipping Allah and trying to do fewer sins beside not eating and drinking from before the Call for Fajr prayer to after the Call for Magrib prayer, Muslims celebrate the first day of the month of Shawwal, for their success in submitting to Allah's command. They perform the Eid prayer first; then, they hold a feast inviting their loved ones, wear their best clothes, and visit their friends and family. The culture of feasting might be different in different Islamic communities, but one thing is for sure; no one is allowed to fast on this exceptional day. Allah also obliges Muslims to share their blessings and happiness with the needy with the money they donate to them. 

5. 10th of Dhu'l-Hijjah: Eid al-Adha

Eid al-Adha is one of the most significant Islamic occasions. Some of the most important events of this Abrahamic religion happened on this day. On this Eid, similar to Eid al-Fitr, Muslims are not allowed to fast. The first is the sacrifice of Ishmael by his father, Abraham, for the sake of Allah. When Abraham and his son both surrendered, and he was ready to behead his son, Allah sent a ram and asked Abraham to kill that instead.

"So when they had both surrendered [to Allah's will], and he had laid him down on his forehead, We called out to him, 'O Abraham! You have indeed fulfilled your vision! Thus indeed do We reward the virtuous! This was indeed a manifest test. Then We ransomed him with a great sacrifice, and left for him a good name in posterity." (37: 103-108)

This day is also the last day of Hajj rituals, in which Muslims shall sacrifice an animal to feed the needy Muslims. On this day, those who attended Hajj have performed all their Hajj rituals, and with the great assistance of Allah, all their sins are wiped away, and Allah accepts their good deeds and repentance.

Many Muslims celebrate this day. They sacrifice an animal to feed the needy, even if they have not attended Hajj. If they do not have enough money to buy a sheep, they do other things and feed the destitute in different ways. This sacrifice is an expression of generosity and obedience to the commands of Allah. This Eid also reminds humankind of the characteristics, such as envy, rage, dishonesty, etc., they have to symbolically sacrifice in themselves to become the better version of themselves and be worthy of being Allah's best creation. 

5. 18th of Dhu'l-Hijjah: Eid al-Ghadir

This Islamic occasion was a day in the last Hajj pilgrimage (Hajjat al-Vida'a) of Prophet Muhammad (PBUH&HP). When he was going back to Medina with all his companions and other pilgrims, he gathered everyone around a place called Ghadir and announced these words in which he appointed Imam Ali b. Abi Talib (AS) as his caliph and the Imam after himself following a direct order from Allah [i]:

"Whomsoever, I am his leader (Mawla), Ali (AS) is also his leader (Mawla). O' Allah! Love those who love him (Ali (AS)) and oppose those who oppose him" [1]

This is another important day in the Muslim calendar. On this day, Muslims can fast and again feed the needy, as an essential part of Islamic culture. 

These are the most significant and most celebrated Islamic occasions. As one can see, feeding others and praying to Allah are the essential things a Muslim should do to celebrate a feast, which reveals the importance of caring for others in Islam that results from the devotion to Allah.  

Notes: 
[i] Verse 67th of Surah al-Maedah known as Al-Tabligh Verse, and the third verse of the same chapter known as Al-Ikmal Verse. 

References:

1.  Ibn Athīr, Usd al-ghāba, vol. 3, p. 605; Kulaynī, al-Kāfī, vol. 1, p. 295; Balādhurī, Ansāb al-ashrāf, vol. 2, p. 110-111;
2.  Ibn Tawus, 'Ali b. Musa, Al-Luhuf 'ala qatla l-tufuf, Uswi, Qom, 1414 AH.
3.  Al-Biruni, Abu Rayhan, The Remaining Signs of Past Centuries, p.331.
4. Qazi al-Tabataii, Muhammad Ali, A Research on the first Arba'een of the Leader of Martyrs (Imam Hussain (AS)), vol.3, p.304.
    

Racism and ethnocentrism are closely linked to the sense of superiority that lies within every human being. This issue has a long history - as long as human life, and is still an ongoing behavior that causes serious problems among human beings.

Racism is an important issue that Islam has considered; the issue whose history dates back to nations existed long before the birth of Prophet Muhammad (PBUH&HP). This unequal treatment was so weaved into people’s lives which they didn’t even realized its vile nature. Prophet Muhammad (PBUH&HP), also, lived in a society where racism was very common. The situation became even harder when people started to follow the religion of Prophet Muhammad (PBUH&HP). That was when racism out of tribal prejudice was extended to segregation based on religion, and many people who followed Prophet Muhammad (PBUH&HP) were driven from their homes or hometowns. 

The specific conditions of the era in which Prophet Muhammad (PBUH&HP) lived, as well as the deep roots of this wrong attitude in the history of humankind, were the main reasons why Allah (SWT) makes many recommendations about racism in the Quran. The Prophet of Islam (PBUH&HP), also, worked really hard to clear the minds of people from tribal, religious, and any other types of racism.

What does the Quran and Prophet Muhammad (PBUH&HP) say about Racism?

During the Arab ignorance, privileges such as lineage, race, wealth, number of children, and affiliation with a powerful tribe were considered the criteria of superiority over others. The verses of the Quran indicate that the number of children and folks were so important to them that in some arguments they even went to a cemetery and started to count the number of their dead ones:

 “Rivalry [and vainglory] distracted you until you visited [even] the graves.” (102: 1-2) 

It should have been hard for people of that mindset to accept that their lineage, children, tribe and wealth is of no importance in the eyes of Prophet Muhammad (PBUH&HP). According to an account, he said, “All the people, from the past or at present, are as equal as a comb’s teeth; therefore neither Arabs are superior to non-Arabs, nor white people to blacks. You are only distinguished by your piety and righteousness” [1]. 

However, although the Quran was revealed in such an environment that was limited in various ways and had a limited connection with the world outside the island, and the issue of ethnicity, race, and tribal life prevailed in all its aspects, it did not take on such a color at all. Allah addresses people in the Quran using the following phrases: "O children of Adam," "O people," "O you who believe," or "O you who have faith." The Quran removed racial privileges in that racist environment, and with the beautiful logic of "you are all children of man and were created from one parent," Allah declared them all brothers and sisters belonging to the same family:

“O mankind! Indeed, We created you from a male and a female and made you nations and tribes that you may identify yourselves with one another. Indeed the noblest of you in the sight of Allah is the most God wary among you. Indeed Allah is all-knowing, all aware.” (49:13)

As the verse above implies, One’s character and status are only measured by the level of submission to Allah and following His commands, not social or financial conditions. 

Religious Discrimination 

Apart from racism based on lineage, race, wealth, etc. people before and at the time of Prophet Muhammad (PBUH&HP) believed that religious beliefs gave them superiority over others. 

Based on that belief, people of different faiths were always conflicting with each other, instead of having sound arguments about different issues. Therefore, religious discriminations had been severely condemned by Islam, emphasizing that belonging to the followers of religion does not make people good or bad. But, it is their actions and their level of obedience toward Allah that give them superiority: 

“The Jews say, ‘The Christians stand on nothing,’ and the Christians say, ‘The Jews stand on nothing,’ though they follow the [same] Book. So said those who had no knowledge, [words] similar to what they say. Allah will judge between them on the Day of Resurrection concerning that about which they used to differ.” (2: 113)

The Quran on sexism 

The issue of fairness and justice among human beings is so important in Islam that the Quran has taken care of all different aspects in which people may act unjustly toward each other. Apart from racial issues that have been ongoing for ages, the issue of undermining and suppressing women in different domestic and social aspects, and depriving them of their rights had been a challenging issue in most parts of the world. 
The Quran condemns this segregation and states that men and women are equal in the eyes of Allah: 

“Whoever acts righteously, [whether] male or female, should he be faithful, We shall revive him with a good life and pay them their reward by the best of what they used to do.” (16:97)

Also, the necessity of observing women’s rights had been emphasized in many narrations from Prophet Muhammad (PBUH&HP) and his progeny. Imam Ali (AS), says in an account, “Women are Allah’s trusts upon you, do not hurt them, and do not put pressure on them” [2]. Therefore, men should be careful with their manners in treating women whether in family or in society. 

To conclude, the only thing that gives superiority to people is their piety and faith. Looking at the issue like this makes people closer to each other and all differences in color, race, ethnicity, shape, wealth, etc. create no distance between people. People gather around based on their spiritual interests and try not to judge each other, since the only one who is aware of the most faithful is Allah (SWT): 
“… And be wary of Allah. Indeed Allah knows best what is in the hearts.” (5: 7).

References:

1. Al-Shaykh Al-Mufid, Al-Ikhtisas, p.341.
2. Muhaddith Nuri ,Mustadrak al-Wasail, vol.2, p.551.