After discovering THIS SITE event schedule situation has been solved.
There are main 4 events mentioned on the website. And we know Challenge Events occur every month on the second weekend.
- Pirates of Corellia ( January )
- Fables of Grimforest
- Guardians of Teltoc
- Knights of Avalon
There are some more explanation here
- Sand Empire ( June )
- SpringVale ( March )
- Santa’s Challenge ( December )
So we passed Pirates of Corellia for January. (2019-01) And I we are sure we will end it with Santa’s Challenge. Ok do we have a certain date for others, any one has a note or google doc link, I would be glad for it.