At my place (India) Shias celebrate this day by arranging dastarkhwan (various special dishes) and call it dastarkhawn of Imam Hasan(A.S)
I want to know why it is celebrated?
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To answer regarding the significance of 22 jumada-al-thani,
I can say that:
As far as I know and as far as I searched, there is not any authentic source regarding the importance of 22 jumada-al-thani. And also as you see at the comment of Battle of Karbala, you can figure out that seemingly no one has heard about the mentioned day (22 Jumada-al-Thani). As a result, there seems not to be a significant subject on the mentioned day.
Salaam, I'm not sure if it is arranged in any other country but in India and Pakistan Imam Hassan dastarkhawan is arranged by Shia community on 22nd Jamal-ul-Sani. As a Muslim we have to learn from two sources, one being the Quran and second is Prophet Muhammad s.a.w life. As taught by Allah and his prophet that giving food to poor and hungry also sharing with people around you is a great deed and has lots of jaza. This was followed by our beloved Imam Ali a.s. As Imam Hassan a.s. Was oldest son he would arrange a dastarkhawan in Madina where food was offered to any traveler or poor and hungry person. Anyone and everyone could eat food from Imams place. This is where it originated from and is followed by Shia community. We arrange the dastarkhawan and as per ones choice and affordability any dish or desert can be offered. It's just a blessing and we follow it to get good deeds and ask Allah for forgiveness and have mercy on us in hardship. Also for barakat in rizq (food/earning). Below is a link for reference. Please pray for me and forgive if any mistake is made above. https://www.google.com.pk/url?sa=t&source=web&cd=11&ved=0ahUKEwj8l8-7tNTVAhXHXhQKHUlqDg0QwqsBCDEwCg&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DwxMQfKZwRbI&usg=AFQjCNGIAvbBVKbxmgL3Qajkk3ZmThne7g