calendar in thunderbird

Hi,
I was looking in Trisquel 10 with KDE for the calendar in Thunderbird.

I couldn’t find it.

Is there a possibility to add a calendar in Thunderbird?

I installed the gnome calender but it has not much features.

I installed the KDE Organiser but it doesn’t work.
Akonadi couldn’t load.

(I will try to install akonadi-calendar tomorrow, if that is possible.
I don’t know it that will solve the problem)

Are there other options to use some calendar in Trisquel in which I can
write several events?

Will Thunderbird in Trisquel 11 Aramo have the calendar?

Kind regards

Gottfried