mawlidunnabi

Shaytan cried loudly on birth of the Holy Prophet (SalAllahu Alaihi Wa Aalihi Wassallam)

And Indeed everyone rejoices except for Shaytan and his counterparts, because:
أن إبليس رن أربع رنات حين لعن وحين أهبط وحين ولد رسول الله صلى الله عليه وسلم وحين أنزلت الفاتحة

Iblis cried loudly four times, first when Allah declared him as cursed, second when he was thrown out, Third When Prophet (salallaho alaihi wasalam) was born and fourth when Surah Fatiha was revealed 
[Ibn Kathir in Al Bidayah wan Nihayah, Volume 2, Page No. 166]
Milad-un-Nabi (صلى الله عليه وآله وسلم)

The uncle of the Prophet (صلى الله عليه و آله وسلم), al-‘Abbas ibn ‘Abd al-Muttalib (RA) said:“And then, when you were born, a light rose over the earth until it illuminated the horizon with its radiance. We are in that illumination and that original light and those paths of guidance and thanks to them we pierce through.”

Ibn Sayyid al-Nas narrated it with his isnad through Tabarani and Bazzar in Minah al-Madh (p. 192-193). Ibn Kathir in al-Sira al-Nabawiyya (4:51) and `Ali al-Qari in his Sharh al-Shifa` (1:364) say it is narrated by Abu Bakr al-Shafi`i and Tabarani, and cited by Ibn `Abd al-Barr in al-Isti`ab and Ibn al-Qayyim in Zad al-Ma`ad.

The light mentioned by al-‘Abbas is confirmed by the Prophet (salla allahu alayhi wa sallam) himself in the famous narration describing his own birth.

Milad-un-Nabi (صلى الله عليه وآله وسلم)

Sayyiduna Aamina (RA) states,
ورأيت ثلاثة أعلام مضروبات علما في المشرق وعلما في المغرب وعلما على ظهر الكعبة فأخذني المخاض فولدت محمدا صلى الله عليه وسلم

“I saw that three flags are sited, One in East, One in West and the third on roof of Ka’ba Shareef and 
Prophet’s (صلى الله عليه وسلم) birth took place.”

(Khasaisul Kubra, Vol1, Pg 82, Published from Darul Kutub Ilmia – Berut)