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As a farmer, a lot of my dates are somewhat flexible.

Certain tasks can't happen until we've had that killing frost in fall. Others can't happen until snow is on the ground. Some happen with spring thaw, some with the end of Mud (the season between Thaw and Summer

I think the way to tackle this is to have a project called 'seasons' that is done sequentially, with each item have a start time that puts it a couple weeks before any reasonable occurence. E.g. Thaw is March 1. Snow gone, April 1

Each item independently set to repeat each year. Thus the season project never actually gets done.

Then other projects have a dependency on one of the actions in Seasons.

Not sure how to do that.