For bookkeeping, I think the closest season move for Tristran is hunting (archery practice not being all stable targets), so mark him as having a bounty of fur and a bounty of meat (which can be used for trading or given as offerings/sacrifices later). 

For Nin, I think tending to her flock is a form of working the land. Mark xp for a right of the land itself and mark a bounty of food (perhaps goats milk cheeses if she prefers not to harm them)

Constance spent her season in rites and celebrations. Choose between an xp for rights of the old ways or of the other world as you prefer.

Robena's is already noted in the IC post.