20th Safar- /Arbaeen (Chehlum - 40th day after Ashura)
According to Imam Hasan bin Ali Al Askari (as) The signs of a true believer are five:-
1) Recite 51 Rak—a’t Salaat during the 24 hours of the day (17 Rak—a’ts obligatory, + 34 Rak—a’ts in Naafilah Salaats).
2) Be in Karbala for Ziyarat of Imam Husayn (as)/other martyrs, or at least recite Ziyarat of the Holy Imam as given below
3) To wear a ring in the right hand.
4) To put the forehead on the earth (preferably on the earth of Karbala) in prostration.
5) To pronounce “Bismillahir-Rah’maanir-Rah’eem” in clear and loud voice while praying the salats.
Imam Ja'far bin Muhammad Al Sadiq (as) had advised to recite the following “Ziarat” on the day of Arbae’en:
The Purpose of Imams mission is very well summarised in this ziarat as "...made every effort and put his heart, mind, soul and life at the disposal of Thy mission to liberate the people from the yoke of ignorance"

Here are the status:
1- Lovely and beautiful interface
2- Audio play
3- Optional playing bar to play favorite part of the dua
4- English and Urdu translation of the dua