The true believers must perform the Ziyarat and send greetings to the Imam every week rather if possible, this should be done every day!
Greeting the Imam can be done at any place and time however it is best to greet the Imam during those times and in those places which he has a special affinity to, such as the night and day of Jumu’ah, the Nights of Qadr in the month of Ramaďhan, the 15th of Sha’ban and special places such as Masjid as-Sahlah and Masjid Jamkaran.
It is recommended to read the Ziyarat of Imam al-Mahdi (ajtf) every day and the visitation rights and salutation to him should be those which have been taught to us by the Ahlul Bayt (as) and recorded in the books of prayers and supplication. These prayers include Ziyarat Aale Yasin1 which can be read at any time one wishes to greet Imam al-’Asr (ajtf), and it starts with2:
سَلاَمٌ عَلٰى آلِ يٰسۤ، أَلسَّلاَمُ عَلَيْكَ يا دَاعِيَ اللهِ...
“Peace be upon the family of Yasin. Peace be upon you O’ caller to Allah...”
In addition, the other special Ziyarat3 for the 12th Imam on the day of Jumu’ah should also be recited [this Ziyarat will be mentioned in the next responsibility.]