I started the adventure named "The Finals" and had to cancel it to start another adventure.
When I canceled it, it said that it would return to my star menu, but after checking in mail and star menu it was nowhere to be found.
I waited a few hours and restarted the game but with no luck.
Contacted support team and they said "I have had several reports on this issue, and unfortunately, there is no fix as of yet."
So I will end this year without finishing event even though I produced everything I need to do it.......great