Ramzan-ul-
Mubarak

10th - Death of Hazrat Khadija - wife of Prophet Mohammad(sawaw)

11th - Brotherhood among Ansar and Muhajireen - (1 AH)

15th - Birth of Imam Hasan(as) - the 2nd Holy Imam - (2 AH)

13th, 14th, 15th - Ayyam-e-Bayd - the bright day

17th - Battle of Badr - (2 AH)

19th Evening - Probable night of Shab-e-Qadr - the night of power

19th - Imam Ali(as) injured by an attack by a munfiq - (40 AH)

20th - Conquest of Makkah - (8 AH)

21st Evening - Probable night of Shab-e-Qadr - the night of Power

21st - Martyrdom of Imam Ali(as) - the 1st Holy Imam - (40 AH)

23rd Evening - Most probable night of Shab-e-Qadr - the night of Power

27th - Another probable night of Shab-e-Qadr - the night of Power

Source - Azadari.com