I have seen Shias celebrate the 22nd Rajab (the seventh Arabic lunar month) by making special cookies and sweet dishes, and by visiting each other.
What is the importance of 22nd Rajab in Islamic history?
What's the background of this day and why do Shias celebrate this day?
I searched to some extent in regard to the importance of 22nd Rajab according to Shia view. I solely found a matter regarding this matter. Seemingly, at the above-mentioned day, Imam Jafar al Sadiq (peace be upon him) has done a miracle. It has mentioned it as Konday and likewise the miracle of Imam Sadiq (peace be upon him). (But to be honest, it was in Pakistani language, thus I was not able to figure out what it say). For further information, you'd better to the reference below if you are familiar with Pakistani.
Reference:
My dear the Kundhe celebrated on 22 Rajab by Shias, which Sunni Muslims adopted to some extent. This fact has no references in Qur'an and Hadith. It is not celebrated because of any miracle or something. The fact of celebration is the death of Ameer Mawiya has made the Shia so happy that they wanted to celebrate and distribute sweets, but due to the fear of the kingdom, they celebrated the death behind closed doors. And still they do all this behind the doors, the announcements and invitations are not involved on this occasion, so this ritual has taken birth behind the doors and has been adopted by many without actual knowledge of Hadiths.
I think this link explains the tradition of the Feast of Nazr on 22 Rajab beautifully. Although it is a social gathering, it is based on the concept of Islamic fulfilment through penance (Nazr), with references from the Qur'an and Ahadith. I think it's quite sad that the story regarding this beautiful tradition has not been passed down by parents to the younger generation.
