I think varvei is the term for celebrations in general because of how it was used in Threatening Note, referring to nightly varvei. Then cynvei = coronation and tabeir = wedding goes along fine with varvei.
Replaying in advance of the Steam launch! And I noticed something that might be a bug? Right at the very start, when I open 26-EN-1 for the first time, it says it's been saved to my list. But when I go to 'list', it's not there.