Lets realize what is the modern way to celebrate. Shaytan (Satan) teaches us to stay away from Allah (SWT). 

In the name of Allah the most gracious the most merciful

Those who disbelieve [in the Oneness of Allâh, and in the Message of Prophet Muhammad SAW ], and hinder (men) from the Path of Allâh (Islâmic Monotheism), He will render their deeds vain^[] . (47:1)

We are staying away from Allah (SWT) without realization. All parties which are being arranged to please people are useless efforts. If we sit inside a party, and talk about politics for example, movies, or other related topics, we are wasting our  time, which we have to answer to Allah on The Day Of Judgment. 

Shaitân (Satan) threatens you with poverty and orders you to commit Fahshâ (evil deeds, illegal sexual intercourse, sins etc.); whereas Allâh promises you Forgiveness from Himself and Bounty, and Allâh is All-Sufficient for His creatures' needs, All-Knower. (2:268)

If this party is not arranged to learn about Islam, and we are not remembering Allah or passing our knowledge amongst each other, then there is no difference between us and non-believers.

There are only two ways, one is the straight path which will take us to obey Allah who promises trouble free life, here and hereafter. One is the wrong path which leads us to sink and drown in this world, this is the path of Shaytan who misguides us and gives us a guarantee that we will never die and making sure your world of your life is permanent which how we furnish our lifestyle

In our parties, as mentioned in the above ayah, today we are arranging these parties and calling all friends and relatives, and the guests are talking about topics other than topics related to Islam, and if we are talking also, the arranger of that party is responsible, because he or she is the one who arranged it in the first place. And who did not arrange the prayer (salah) and the topic in the party about Islam, and did not call people who practicing Muslims, if the intention of the arranger is not to involve Islam inside the party from the first place, then the arranger is responsible for the time wasted at the party by the guests.

WHAT DOES ALLAH TEACH US IN THE QURAN ABOUT WHAT KIND OF PEOPLE WE SHOULD INVITE TO OUR PARTIES AND FUNCTIONS?

And keep yourself (O Muhammad SAW) patiently with those who call on their Lord (i.e. your companions who remember their Lord with glorification, praising in prayers, etc., and other righteous deeds, etc.) morning and afternoon, seeking His Face, and let not your eyes overlook them, desiring the pomp and glitter of the life of the world; and obey not him whose heart We have made heedless of Our Remembrance, one who follows his own lusts and whose affair (deeds) has been lost. (18:28)

Now one should focus the above ayah in details, what does Allah order our beloved Prophet (SAW), who is our leader and living example?

Was this message in the Qur'an only for him? If anyone sees who is the most closest to Allah other than the Prophet (SAW), and after that the companions?.

If any Muslim claims that he or she is a Muslim, shouldn't he follow the examples of our beloved Prophet (SAW), and the order of Allah (SWT)?

If one disobeys any ayah in the Quran, how can we then even call ourselves Muslim?

What was the manner of gatherings that involved the Prophet (SAW)?

The Prophet (SAW) use to prepare food for family relatives, who were not Muslim, and after the meal the Prophet (SAW) would start explaining Islam, all the guests use to laugh and leave. 

Can anyone check when did the Prophet (SAW) during his duration of twenty three years of prophecy, who loved anyone the way the companions of the Prophet (SAW) use to love him?

Can anyone see when did the companions of the Prophet, or the tabie'een (the second generation) ever celebrate the birthday of the Prophet. 

In the time of ignorance before the light of Islam, the parties were full of dance, music, poetry on worldly matters. Shouldn't we follow what our prophet (SAW) taught to stay Muslim? Because any action which is an innovation in religion by us to show we love the Prophet (SAW), I can guarantee no one could love the Prophet (SAW) more than his companions. We should stop following the non-believers to celebrate there parties, and to celebrate birthdays, and anniversaries.

According to the teachings of our beloved Prophet (SAW), the only two celebrations which are permissible are the two Eids. The Eid after Ramadan (Eid-ul-Fitr), and the second Eid for the sacrifice (Eid-ul-adha).

We should teach ourselves and our children, what is the birthday? Each and every birthday reminds us that we are going closer and closer towards death. The number of years which have passed  already shortened from our life, and that is only a dream which has already passed.

We should thank Allah, who has kept us until know healthy with our body parts functioning properly, and to make two nafl prayer to Allah.