According to Hadith, Laylatul Qadr is either on the 19th, 21st or 23rd night of Ramadhan. More emphasis is laid on the 21st and the 23rd, particularly the 23rd.
The A`maal for this night are:
1. The common A`maal for the three nights of Qadr, including:
a) Ghusl.
b) Namaz Two rak`aat namaz; in each rak`ah after Sura al¬Hamd recite Sura
al¬Ikhlas 7 times.
c) Ziyarat of Imam Hussein
d) Say 100 times:
'Astaghfirullaaha Rabbee Wa¬atoobu Ilayh'
I seek forgiveness of Allah, and I turn (repentant) to Him.
e) Say 100 times:
'Allahumma il¬`an Qatalata ¬ameeril mu'mineen'
O Allah, curse the ones who killed Ameerul Mu"mineen.
f) Du`a of Jawshane Kabeer is also recommended on this night.
2) Munajat of Imam Ali (a.s):
This is because Imam Ali was injured this night by the sword of Ibn-e-Mojlam (May Allah Curse be upon him). Our beloved Imam Ali(a.s) Suffered in pain for 2 night and was buried in Najaaf on 21st Ramadhan.