Shaban-ul-
Moazzam

1st - Birth of Hazrat Zainab(sa) - (5 AH)

3rd - Birth of Imam Hussain(as) - the 3rd Holy Imam - (4 AH)

4th - Birth of Hazrat Abbas(as) - (26 AH)

5th - Birth of Imam Zain-al-Abideen(as) - the 4th Holy Imam - (38 AH)

7th - Birth of Hazrat Qasim ibn-e-Hasan(as) - (48 AH)

8th - Beginning of Ghaibat-e-Sughra of Imam Mehdi(as) - (160 AH)

11th - Birth of Hazrat Ali Akbar(as) - (44 AH)

14th Evening - Aamal of Neema-e-Shabaan

15th - Birth of Imam Mohammad Mehdi(as) - the 12th Holy Imam - (255 AH)

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

27th, 28th, 29th - Fasting 3 days prior to Ramzan-ul-Mubarak

Source - Azadari.com