Rabī al-Awwal Islamic Events

Masjid al-Quba, the first mosque, was built in this month.06 Rabī‘ al-Awwal 1404 AH, death of Hazrat Khwaja Allah Bakhsh Abbasi Naqshbandi
08 Rabī‘ al-Awwal, death of Twelver Imām, Hasan al-‘Askarī (see: Chup Tazia)
08 Rabī‘ al-Awwal, death of Ghawth al-Atham, Sheikh Abd al-Qadir Al-Jilani
09 Rabī‘ al-Awwal, Eid e shuja

12 Rabī‘ al-Awwal, traditional Sunni's observe Mawlid in commemoration of Muhammad's PBUH Birthday

17 Rabī‘ al-Awwal, Shi‘ah Muslims celebrate the birthday of Muhammad and the Shī‘ah Imām, Ja‘far al-Sādiq.
18 Rabī‘ al-Awwal, birth of Umm Khultum bint Ali
26 Rabī‘ al-Awwal, death of Abu Talib ibn Abdul Muttalib
26 Rabī‘ al-Awwal 1333 AH, death of Khwaja Sirajuddin Naqshbandi, a Naqshbandi Sufi shaykh

Other events:
The Hijra (migration) took place in this month
Eid-e-Zahra (a.k.a. Eid e shuja), a celebration of Shi‘ah Muslims
Marriage of Muhammad to Khadijah bint Khuwaylid
Building of the Quba Mosque (1st mosque in Islam)