Brief introduction of 22nd Rajab according to Shia historians:
In the book of Masar al-Shia, Sheikh Mufid (r.a) has considered this day as the day of the destruction of one of the enemies of the Prophet (pbuh). Also the book of Iqbal al-A'amal also quotes where Sheikh Mufid (r.a) who has considered this day as the day of joy for the believers, It has been reported that on the 22nd day of the months of Rajab gratefully annihilated one of the pharaohs of the time and the enemies of the Holy family of the Prophet (pbuh), therefore it is recommended to fast (Mustahabb) as a Thank God for the destruction of the enemies of the Holy family of the Prophet (pbuh).
Reference: 1-Sheikh Mufid,Muhammad bin Muhammad, Masar al Shia, page 59,Sheikh Mufid conference, Qom.
2-Syed ibne Taoos, Iqbal al A’mal, page 667, Dar al Kutub al Islamia, Tehran 1367
While there is no direct and clear thing as the Nazr of Imam Sadeq (AS) on 22nd of the Rajab has been discussed in the authentic Shia hadith sources, but the best part about this Nazr or any community wide Nazr is the perfect opportunity to meet random Shia families and making new friends as a Silatur Rahm. Where you are meeting just to hang out, eat some snacks and sweets together and sit there on your friend's table meeting people, all in the name of Ahlulbayt (a.s).
Needless to say, we should forget about what other Shia communities say, either they are from majority Shia countries or different background so they can’t feel or understand the benefits of this Nazr. But we have to built a strong network among our Shia community as we are in minority.May Allah accept and give us opportunity to remember Ahlul Bait (a.s) in all our gatherings.
الامامُ الرِّضا علیه السلام : «رَحِمَ اللّهُ عَبْدا اَحْیا أمْرَنا،»[قال الرّاوی:] فَقُلْتُ لَهُ: «فَکَیْفَ یُحْیِی أمْرَکُمْ؟» قالَ: «یَتَعَلَّمُ عُلُومَنا و یُعَلِّمُها النّاسَ، فَإِنَّ النّاسَ لَوْ عَلِمُوا مَحاسِنَ کَلامِنا لاَتَّبَعُونا.
Imam Ali Ar Redha(a.s) said: “May God have mercy on the servant, who keeps alive our commands.” And when he was asked :how do we keep alive your commands? then he said: “Teach our sciences to people and when they would learn our beautiful words and it’s merits they would not go away from us.