Each year on the 12th of Rabi` al-Awwal, after the salat al-Maghrib, the four qadis of Makkah (representing the Four Schools) and large groups of people including the fuqaha’ (scholars) and fudala’ (notables) of Makkah, shaykhs, zawiya teachers and their students, ru’asa’ (magistrates), and muta`ammamin (scholars) leave the mosque and set out collectively for a visit to the birthplace of the Prophet, shouting out dhikr and tahlil (LA ILAHA ILLALLAH). The houses on the route are illuminated with numerous lanterns and large candles, and a great many people are out and about. They all wear special clothes and they take their children with them. Having reached the birthplace, inside a special sermon for the occasion of the birthday of the Prophet is delivered, mentioning the miracles (karamat) that took place on that occasion. Hereafter the du`a’ for the Sultan (i.e. the Caliph), the Emir of Makkah, and the Shafi`i qadi is performed and all pray humbly. Shortly before the salat al-`Isha’, the whole party returns from the birthplace of the Prophet to the Great Mosque, which is almost overcrowded, and all sit down in rows at the foot of the Maqam Ibrahim. In the mosque, a preacher first mentions the tahmid (AL HAMDULILLAH) and the tahlil, and once again the du`a’ for the Sultan, the Emir, and the Shafi`i qadi is performed. After this the call for the Salat al-`Isha’ is made. After the salat, the crowd breaks up. A similar description is given by al-Diyarbakri (d. 960) in his Ta’rikh al-Khamis. [..read on..]
see also,The Academic History of the Blessed House of Mawlid An-Nabi (s.a.w).